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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

http://www.mgispeedware.com/guides-documentation


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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.


Alternate Connection




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Pro-Street Neon Rocker Connections

Switch Relative Position

from terminal side.


from terminal side.

Pro-Street Level Rocker Switch Connection Scheme

Switch Models #: SW-ROC-PS30X/X


Switch Model #: SW-ROC-PS301/R

LOAD

12vDC LOAD12vDCSwitch is

Non-illuminated.

(OR)

Pro-Street Rocker


from terminal side.

Switch Model #: SW-ROC-PSBLK




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


Paper Label This Side

Switch LED Has

Polarity.

N/A


LOAD

12vDC

Classic Car Automotive Surface Mount Rocker


from terminal side.

Classic Car Automotive Surface Mount Rocker Switch Connection Scheme

Switch Models #: SW-ROC-SM20X/X


Switch Paper Label

Switch LED Has

Polarity.

N/A


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


from terminal side.



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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.


32112vDC LOAD 1

654

LOAD 2




321

12vDC

LOAD 1654




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


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


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.


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]

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