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www.mgispeedware.com — A Division of Medusa Group Inc.
Installation Manual
Switch Control Panels (SCP)
Version 2.3 • December 2018
SCP Installation Manual
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Table of Contents Introduction .............................................................................................................................................. 3
What’s Included ........................................................................................................................................ 3
Sizing Your Own Fuse and Feeder ............................................................................................................. 4
Customizing your SCP ............................................................................................................................... 5
General Installation ................................................................................................................................... 6
Race Level Marine Rocker Connections ................................................................................................ 7
Pro-Street Neon Rocker Connections ................................................................................................... 8
Classic Car Duckbill Toggle Connections ............................................................................................... 9
Classic Car Surface Mount Rocker Connection ..................................................................................... 9
Off-Road LED Toggle Switch Connection .............................................................................................. 9
Off-Road Metal Toggle Switch Connection ......................................................................................... 10
Momentary LED Pushbutton Connection ........................................................................................... 11
4 Position Ignition Key Switch Connection ......................................................................................... 11
Connecting your SCP to a Relay Control Panel (RCP) .............................................................................. 12
Features and Helpful Tips ....................................................................................................................... 13
Wire Gauge Table .................................................................................................................................... 16
Warranty ................................................................................................................................................. 18
Automotive Specs Sheet ......................................................................................................................... 20
MGI highly recommends reading this Installation Manual in its entirety before proceeding with
purchase and installation of any RCP.
Nomenclature applied throughout this document
MGI – Medusa Group Inc.
NEC – National Electrical Code
SAE – Society of Automotive Engineers
SCP – Switch Control Panel
RCP – Relay Control Panel
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Introduction
This installation manual contains general specifications for all MGI Switch Control Panel wiring
kits (SCPs). This manual is intended to be used in conjunction with the appropriate SCP
electrical schematic found online. In addition to the information in this manual, other helpful
resources can be found at:
www.mgispeedware.com/guides-documentation
What’s Included
Each MGI SCP wiring kit is provided as individual components requiring some assembly.
Optional factory assembly is available during online customization at additional cost.
Complete Wiring Kits
Choice of 4 to 8 premium 12vDc switches
Main fuse & fuse holder
5’ of red main feeder input cable
5’ of 14 AWG primary wire for each switch output
5’ of split sleeve wire wrap
All necessary jumper wires and crimp terminals
Stainless steel faceplate
Peel and stick identifying labels
Unless otherwise selected prior to checkout, Switch Control Panels are provided as standard
with the following main feeder conductor and fuses:
SCP4 SCP5 SCP6 SCP7 SCP8
Feeder Size 12 AWG 10 AWG 8 AWG 8 AWG 8 AWG
Main Fuse Size 40A 50A 60A 70A 100A
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Sizing Your Own Fuse and Feeder
Loads connected to an SCP are all expected to be operated as non-continuous use (defined by
the NEC as having less than 3 hours of continuous use).
MAIN FEEDER
Accordingly (and with a slight additional amperage capacity over that required by the NEC), the
red main feeder conductor should be sized to carry a minimum of:
Main Feeder Size
( 𝟏𝟐𝟓% × 𝒍𝒂𝒓𝒈𝒆𝒔𝒕 𝒊𝒏𝒅𝒊𝒗𝒊𝒅𝒖𝒂𝒍 𝒍𝒐𝒂𝒅 𝒂𝒎𝒑𝒆𝒓𝒂𝒈𝒆 )
+
( 𝑺𝒖𝒎 𝒐𝒇 𝒂𝒍𝒍 𝒐𝒕𝒉𝒆𝒓 𝒊𝒏𝒅𝒊𝒗𝒊𝒅𝒖𝒂𝒍 𝒍𝒐𝒂𝒅𝒔
𝒕𝒉𝒂𝒕 𝒂𝒓𝒆 𝒄𝒐𝒏𝒏𝒆𝒄𝒕𝒆𝒅 𝒕𝒐 𝒕𝒉𝒆 𝑹𝑪𝑷 )
MAIN FUSE
Similarly, the SCP main fuse should be sized as follows:
Caution! Always follow the manufacturer’s fuse size requirement (or any other requirements) for your specific
load over that of the general recommendations in this manual. It is the user’s responsibility to ensure that the
main feeder & branch conductor sizes, main fuse size, and branch fuse sizes selected and installed are
appropriate as defined by the NEC and SAE for the user’s specific application.
Fuses for individual loads should generally be sized to 125% of the rated amperage for lighting
or resistive loads, and 250% for motor loads.
Eg: 10A interior lighting – 12.5A fuse (or next larger size available)
Eg: 16A motor load – select a 40A fuse.
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Customizing your SCP
SCPs are available with various switch types and add-ons.
Switches
Off-Road metal toggle switches (non-illuminated – 20A)
Off-Road LED toggle switches (illuminated green tip – 20A)
Classic Car duckbill toggle switches (illuminated – 15A)
Classic Car surface mount rockers (illuminated – 15A)
Pro-Street neon rocker switches (illuminated neon – 15A)
Race Level marine rocker switches (illuminated LED – 20A)
Each switch type offers a number of variations, including your choice of color and contact form
if applicable. Our online panel builder lets you choose the switch you want and where you want
it. Most panels can accommodate between 4 and 8 switches.
Extra Pushbutton or Ignition Key Switch
Off-Road and Classic Car SCPs can come installed with a momentary LED pushbutton or ignition
key switch. The 3A pushbutton requires an additional relay to control any load.
Optional Breakers
Off-Road and Classic Car SCPs can also come installed with optional branch breakers and LED
diodes that illuminate when its corresponding switch is ON.
Aluminum Enclosure
MGI offers a lightweight aluminum enclosure that confines and protects the wire connections
behind the switch panel faceplate. Weatherproof enclosures are only available for Off-Road
(non-illuminated) and Race Level (horizontal) SCPs.
Professional Assembly
MGI can fully test and assemble your panel.
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General Installation
STEP 1: Install the SCP in a clean and dry environment.
STEP 2: Connect one end of the red main feeder conductor to the car starter’s battery power
terminal. Install the supplied main fuse and holder (shown as F10 in SCP Electrical Drawings) in
the main feeder conductor between the starter and the MGI Switch Control Panel.
STEP 3: Install the output conductors from the SCP to each of your branch circuits – providing
each branch circuit meets the use criteria for a switch without switching relay, and providing
each individual load’s rated amperage is within the switch’s rated load capacity.
See the connection schemes below for specific switch type wiring.
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Race Level Marine Rocker Connections
32
712vDC LOAD
Switch LED Has
Polarity.
N/A
12vDC LOAD 1
Switch LED Has
Polarity.
32
7
1
LOAD 2
Note 1: Switch closes (2 to 1)or(2 to 3) - not both at the same time. If
the user needs to have LOAD 1 turned on in(2 to 1)position, and Both
LOAD 1 and LOAD 2 turned on in(2 to 3)position, then add a (load
current)sized diode between terminal 1 and terminal 3.
Race Level Rocker
Race Level Rocker
32
712vDC LOAD
Switch LED Has
Polarity.
N/A
Race Level Rocker
Race Level Rocker Switch Connection Scheme
12vDC LOAD 1
Switch LED Has
Polarity.
N/A
32
7
1
LOAD 2
Note 1: Switch closes (2 to 1) or (2 to 3)- not both at the same time. If the
user needs to have LOAD 1 turned on in (2 to 1)position, and Both LOAD 1
and LOAD 2 turned on in (2 to 3) position, then add a (load current)sized
diode between terminal 1 and terminal 3.
Race Level Rocker
Switch Models #: SW-ROC-RL101/X
Switch Models #: SW-ROC-RL102/R
Switch Models #: SW-ROC-RL103/X
Switch Models #: SW-ROC-RL104/B
Suffix (X)= Any letter.
Suffix (X)= Any letter.
Alternate Connection
Alternate Connection
Alternate Connection
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Pro-Street Neon Rocker Connections
Switch Relative Position
from terminal side.
Switch Relative Position
from terminal side.
Pro-Street Level Rocker Switch Connection Scheme
Switch Models #: SW-ROC-PS30X/X
Suffix (X)= Any letter.
Switch Model #: SW-ROC-PS301/R
LOAD
12vDC LOAD12vDCSwitch is
Non-illuminated.
(OR)
Pro-Street Rocker
Switch Relative Position
from terminal side.
Switch Model #: SW-ROC-PSBLK
Alternate Connection
Alternate Connection
Alternate Connection
LOAD
12vDC LOAD12vDCSwitch LED Has
NO Polarity.
(OR)
Pro-Street Rocker
LOAD
12vDC LOAD12vDCSwitch LED Has
NO Polarity.
(OR)
Pro-Street Rocker
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Classic Car Duckbill Toggle Connections
Classic Car Surface Mount Rocker Connection
Off-Road LED Toggle Switch Connection
LOAD
12vDC
Classic Car Duck Bill Toggle Switch
Switch Relative Position from terminal side.
Classic Car Duck Bill Toggle Switch Connection Scheme
Switch Models #: SW-TOG-DB114/X
Suffix (X)= Any letter.
Paper Label This Side
Switch LED Has
Polarity.
N/A
Alternate Connection
LOAD
12vDC
Classic Car Automotive Surface Mount Rocker
Switch Relative Position
from terminal side.
Classic Car Automotive Surface Mount Rocker Switch Connection Scheme
Switch Models #: SW-ROC-SM20X/X
Suffix (X)= Any letter.
Switch Paper Label
Switch LED Has
Polarity.
N/A
Alternate Connection
13
12vDC LOAD
Switch LED Has
Polarity.
N/A
Metal Bat Handle Toggle c/w Green Tip LED
Metal Bat Handle Toggle Switch c/w Green Tip LED Switch Connection Scheme
Switch Model #: SW-TOG-LBH113
Switch Relative Position
from terminal side.
Alternate Connection
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Off-Road Metal Toggle Switch Connection
LOAD 1321
LOAD 2
Note 1: Switch closes (2 to 1) or (2 to 3) - not both at the same time. If the user
needs to have LOAD 1 turned on in (2 to 1) position, and Both LOAD 1 and LOAD
2 turned on in (2 to 3) position, then add a (load current) sized diode between
terminal 1 and terminal 3.
Off-Road Metal Bat Handle Toggle Switch Switch Model #: SW-TOG-BH104
12vDC LOAD 1654
LOAD 2
Note 1: Switch closes (2 to 1) + (5 to 4)or (2 to 3) + (5 - 6) - not both at the same
time. Terminals (1 and 4), (2 and 5), (3 and 6)are all indepenent from each other.
Off-Road Metal Bat Handle Toggle Switch Switch Model #: SW-TOG-BH105
32112vDC LOAD 1
654
LOAD 2
Note 1: Switch closes (2 to 1) + (5 to 4)or (2 to 3) + (5 - 6) - not both at the same
time. Terminals (1 and 4), (2 and 5), (3 and 6)are all indepenent from each other.
Off-Road Metal Bat Handle Toggle Switch Switch Model #: SW-TOG-BH106
321
12vDC
LOAD 1654
Note 1: Switch closes (2 to 1) + (5 to 4)or (2 to 3) + (5 - 6) - not both at the same
time. Terminals (1 and 4), (2 and 5), (3 and 6)are all indepenent from each other.
Off-Road Metal Bat Handle Toggle Switch Switch Model #: SW-TOG-BH105
321
654
321BLACK
REDJumpers
Switch (External) View Switch (Internal) View
Reversing a 12vDC PM Motor
12vDC
PM Motor
LOAD
12vDC
Off-Road Metal Bat Handle Toggle Switch
Switch Relative Position
from terminal side.
Off-Road Metal Bat Handle Toggle Switch Connection Schemes
Switch Model #: SW-TOG-BH101
LOAD
12vDC
Off-Road Metal Bat Handle Toggle Switch
Switch Relative Position
from terminal side.
Switch Model #: SW-TOG-BH102
Switch has No polarity. Switch has No polarity.
1 3 1 3
12vDC LOAD 1321
LOAD 2
Note 1: Switch closes (2 to 1) or (2 to 3) - not both at the same time. If the user
needs to have LOAD 1 turned on in (2 to 1) position, and Both LOAD 1 and LOAD
2 turned on in (2 to 3) position, then add a (load current) sized diode between
terminal 1 and terminal 3.
Off-Road Metal Bat Handle Toggle Switch Switch Model #: SW-TOG-BH103
12vDC
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Momentary LED Pushbutton Connection
4 Position Ignition Key Switch Connection
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Connecting your SCP to a Relay Control Panel (RCP)
Install the conductors between any SCP and RCP per the appropriate RCP Electrical Drawing.
The main fuse supplied with the SCP kit should not be used provided that all SCP circuits are
used to switch or control an RCP relay.
Warning: When an SCP is fed power through the RCP, your loads cannot be connected directly
to an SCP switch output. The positive conductor between the SCP and RCP is a 16 AWG wire
fused at 5A.
Where you want to operate some loads directly from the output of an SCP switch, and other
loads from an RCP (Eg: Connecting an SCP8 to an RCP6), then the input power to the SCP must
be taken from the RCP input red battery terminal (not from the RCP fused 5A control circuit).
The main feeder conductor and main fuse must be properly sized for the entire load.
SCPs are supplied with 5 feet of wire loom to be installed around the conductors between the
SCP and RCP. SCP enclosures and RCP kits are supplied complete with a strain-relief connector
that easily encompasses the wire loom encased conductors between the SCP enclosure and
RCP.
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Features and Helpful Tips
Main Fuse and Holder
To change the main fuse (shown as F10), gently squeeze the fuse holder cover – about 1” from
each end of the cover – and lift carefully. Replace the cover using the same technique. Failure
to follow these instructions can result in damage to the plastic fuse cover mounting tabs.
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Relays
Always use a switching relay for any electric motor, spotlight, or high-current resistive load
(amplifiers, etc.). Switching relays are also necessary on the output of an MGI SW-PB101
pushbutton. MGI offers 40A changeover relays and 80A heavy-duty relays.
Factory Installed LEDs
Some MGI SCPs are supplied with factory-installed LEDs. These 3mm LEDs are very bright. For
more subtle LED light (50% less candlepower), add a separately purchased EP-R101 damper
resistor kit.
A single EP-R101 damper resistor can be used with an SCP where 4 to 8 LEDs are already
installed. Simply disconnect the 3mm LED (black wire with ring terminal) from its ground
terminal and add the damper resistor in series between the disconnected LED ring
terminal and ground.
Insulate the resistor and/or black wire ring terminals as may be required.
ON/OFF Nameplates
ON/OFF toggle switch nameplates are supplied as standard with metal toggle switches only.
The nameplates can also be purchased separately for use with duckbill toggle switches. When
using these nameplates with duckbill toggle switches, you must file off the small male tab in the
nameplate so that the nameplate can be mounted on the duckbill toggle.
Crimp Terminals
When wiring to any Classic Car surface mount rocker (SW-ROC-SM20X/X), use only BLUE female
disconnect crimp terminals. While RED female disconnects are generally the same physical
spade size as BLUE female disconnects, the RED female disconnects supplied by MGI will NOT fit
the Classic Car surface mount rocker male spade terminals.
Supplied crimp terminals for GXL or TXL wire may best be used per the following MGI standard:
Red crimp terminals: Use with #18, #16, and #14 AWG
Blue crimp terminals: Use with #12 AWG
Yellow crimp terminals: Use with #10 AWG
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Screw Type Pin Connections and Ring Terminals
Non-illuminated metal bat-handle toggle switches have screw terminals.
When connecting a wire ring terminal under the switch screw terminal, it is important to firmly
hold BOTH the wire ring terminal and switch body so that tightening the switch screw terminal
does not twist that terminal loose from the switch body pin.
Output Wire
SCPs are provided with GXL #14 AWG wire for the output of each switch (with the exception of
output wire for an SW-PB101 pushbutton, which is GXL #16 AWG). It is also the user’s
responsibility to install proper output branch fuses/breakers as may be required by the NEC and
SAE for individual loads.
All SCP installations should be completed minimally per the current and wire sizing
specifications outlined in the Wire Gauge Table outlined below, and per SAE electrical codes for
low voltage circuits under 32v.
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Wire Gauge Table
Table 1: NEC Recommended AWG/Ampacity chart for copper GXL or SGX automotive primary wire, applied in a “Free Air” 12vDC circuit. Found online at www.mgispeedware.com/guides-documentation/wire-size-chart/
Find This Interactive Table Online
This printable table is a “captured” photo of the online interactive chart with calculations set
for a) single load branch conductors, b) 20°C ambient air temperature, and c) 3% voltage drop
based on a 13.8vDC nominal voltage.
Use the interactive version on MGI’s website located under Guides and Documentation
to properly determine the size of your branch and feeder conductors.
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Free Air Definition
While this table outlines specifics for single copper conductors in “Free Air” per the NEC, your
automotive electrical installation does not necessarily conform to a “Free Air” definition.
Granted, your conductors are not installed in a heat encompassing shield such as metal conduit
or PVC tube either. Your conductors may be held firmly inside breathable wire loom or sleeving,
and may be tie-wrapped or secured with a multitude of other conductors.
MGI can, however, appropriately suggest that you increase the Ambient Air
Temperature correction factor to allow for any heat restraints outlined above.
Maximum Voltage Drop
NEC standards allow for a maximum 3% voltage drop in feeder conductors, and a maximum 5%
voltage drop in branch conductors.
Branch conductor
Branch conductors are sized to carry 100% of load rated amperage per the NEC minimal
requirement for non-continuous use (defined by the NEC as having less than 3 hours of
continual use).
Feeder conductor
Feeder conductors are sized slightly larger than the NEC minimal requirement for non-
continuous use. Feeder conductors are sized to carry a minimum of 125% of the largest load’s
rated amperage + the total amperage of all other individual loads that are connected to the
feeder conductor.
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Warranty
1.1 Medusa Group Inc. warrants each of its products to be free from defects in materials or
workmanship when operated under normal working conditions and in accordance with
manufacturer's installation and operating instructions, for a period of twelve months
from the date of purchase. This warranty shall be in lieu of any other warranty
expressed or implied, including but not limited to any implied warranty of
merchantability or fitness for a particular purpose.
1.2 MGI shall not be responsible for removal, installation, or any other incidental or
consequential damages arising from, or caused by the use of any of its products.
1.3 MGI’s liability under this warranty shall be solely limited to the replacement or repair of
its defective product within the warranty period, and shall not be liable under any
circumstances for any damages including but not limited to personal injury or labor
costs. Under no circumstances will MGI be responsible for any repairs made by anyone
other than the factory or authorized repair depot, unless such repairs have been
authorized in writing by MGI.
1.4 Remedy for warranty shall include one of the following:
Where the complete product is returned to MGI
1.4.1 MGI will repair or replace, at its sole discretion, any component that has been
found to be defective by the manufacturer, and is within the warranty period,
provided that the complete product is shipped with factory authorization,
freight prepaid, to the nearest MGI factory outlet or authorized service facility.
Upon completion of warranty repairs, MGI, or its authorized service center will
return the product freight prepaid, using Standard Ground delivery service as
selected by MGI.
Where the product remains installed in the automobile, and where one or more components
are determined to be faulty
1.4.2 Where any component is determined by MGI to be faulty within the warranty period, and where such a component is provided for under the terms of warranty, the replacement component will be shipped freight prepaid, (component pre-billed to the client) using Standard Ground delivery services as selected by MGI.
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1.4.3 Any faulty or damaged component that has been replaced under the terms of warranty must be returned to MGI within 15 days, freight prepaid, in order to validate the warranty. MGI will evaluate and will either approve or deny the warranty claim, and will credit the client’s payment method according to MGI’s ruling. Some exceptions may apply.
1.5 Where any warranty component is requested by the recipient with delivery service
other than Standard Ground, the product will be shipped freight collect only.
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Automotive Specs Sheet
Loads
Load Type (Eg: Water Pump, Fan 1, Fan 2), etc.
Connected to SCP (terminal #)
Load Amps
Fuse size
Load 1
Load 2
Load 3
Load 4
Load 5
Load 6
Load 7
Load 8
Load 9
Load 10
Load 11
Load 12
For technical help, contact MGI at [email protected]