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If only one wire pair (sensor input) is to be used, the other pair must be twisted together and insulated via
heat shrink or some other secure means to prevent contact with any vehicle structures and to ensure it does
not interfere with any moving parts in the vehicle.
The signal to be monitored should have two voltage states: One where there is no voltage (i.e. zero volts
when referenced to ground) and another that falls in the range +5 to +24 or -5 to -24 volts. The signal being
monitored should be capable of supplying 3 mA when a voltage is present. It is important that the voltage
signal be tested to ensure it is continuously providing the necessary voltage and current when in the "on"
or "active" position.
The following table shows how the signals are interpreted.
Wire A (Black)
Wire B (Blue or Purple) Off (-3V < x < +3V)
Note: If you're replacing a previously installed 3500/SSEM with sensor input(s) with a 5000 series unit,
you must reinstall the sensor inputs using the Sensor Input Harness available for the 5000 series unit.
The SSEM sensor harness is NOT compatible with the 5000 series units.
Optional Sensor Installation Instructions (cont.)
Ground or reference for wire B
On (-24V < x < -5V or +5V < x < +24V)
Undefined (-5V < x < -3V or +3V < x < +5V)
19
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