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NEXUS R5 WIRING
Main Power
The NEXUS R5 must be connected to battery
positive and battery negative at all times for
correct operation.
• Connect the NEXUS R5 to the positive battery
IGNITION
SWITCH
terminal via the supplied RED SurLok connector
using 1AWG cable and to the negative battery
terminal via the black SurLok connector using
1AWG cable.
There is an internal 32VDC 200A Positive Inline
Fuse inside the ECU for overcurrent protection.
NOTE: the fuse is not a user-serviceable part.
An ignition switch input must be wired to the
Method 1: Power Wiring using Pin A26
NEXUS R5 to turn the unit on.
There are two ways to provide an ignition switch
signal:
This power for ignition switch provides a very
low current constant +12V signal and must only
• Method 1: Connect the power for ignition
be used to provide a signal back into the ignition
switch on pin A26 to one side of the ignition switch,
switch input.
and connect the ignition switch input on pin A13 to
the other side of the switch.
The battery ground pins on the NEXUS R5 are
NOT used to ground the ECU and should not be
This way, when the ignition switch is closed, the
connected to battery negative or the chassis.
ECU will see a +12V signal on the ignition switch
input and power up the ECU.
The battery ground pins are capable of 3A current
per pin and are directly linked to the battery
• Method 2: instead of using the power for ignition
negative stud internal to the NEXUS R5.
switch pin, the hot side of the ignition switch can
simply be wired to any constant +12V source,
These pins are for shielding or to ground low
such that a +12V signal is detected on the ignition
current CAN devices (e.g. keypads) and digital
switch input to power up the ECU.
sensors.
A13
A26
A13
IGNITION
SWITCH
-
-
+
Method 2: Power Wiring using external
constant +12V source
There are two sensor +5V pins (A and B) for
sensors, and two signal ground pins (A and B).
Each is capable of 200mA and can be used in any
order, e.g +5V supply (A) and signal ground (B) can
be wired to the same sensor.
10
MOUNTING TEMPLATE
+
SurLok terminals installed
11
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