Master Relay
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User’s Manual
3
Installation
Mounting
The MSEL Master Relay has two tags designed for mounting the device to a flat surface. The
spacing between the mounting holes is 84mm (see
for details). The location of the
Master Relay, as well as the total current load, can have significant effect on the internal
temperature of the Master Relay. Where possible try to mount the Master Relay away from
significant heat sources.
Electrical Connection
The Master Relay is connected between the positive terminal of the battery and the rest of
the vehicles positive power supply. The device should be positioned as close to the battery
as possible, keeping the positive lead as short as you can. See the
a typical installation.
ENSURE THAT THE GROUND CONNECTION IS MADE BEFORE CONNECTING THE
BATTERY AND VEHICLE TERMINALS.
Power Studs
The battery and output terminals are copper plated M6 studs. Care should be taken to
ensure that cables are insulated from the housing and neighbouring studs. It is
recommended to use the supplied nut caps with insulated lugs, or for maximum
protection, rubber insulating boots can be used on each stud.
Interface Connector
All low current connections are made through a single 6-way Souriau mil-spec connector;
keeping things tidy, protected and allowing for quick removal / installation.
The mating connector (Souriau 8STA6-04-06SN) can be purchased individually for
custom installs or a breakout harness with DTM connectors is available for generic
installs.
Table 1: Interface connector pinout
Pin Function
Colour
1
Ground
Black
2
Driver Switch
Blue
3
External Switch
Orange
4
PDM / ECU Output
Brown
5
CAN L
Green
6
CAN H
Yellow
Table 1 shows the pinout along with the standard wiring colours supplied with the breakout
harness. For those making a custom harness the Souriau connector has #26 terminals
and accept 30AWG through to 24AWG wire.
