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©
2002
Directed Electronics, Inc.
Secondary Harness (H2),
Wire Connection Guide
Secondary Harness (H2) Wiring Diagram
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Secondary Harness Wire Descriptions
H2/1 GRAY/BLACK (-) Diesel Wait-to-Start Bulb Input
Connect this wire to the wire in the vehicle that sends the signal to turn on the WAIT-TO-START
bulb in the dashboard. In most diesels the wire is negative (ground turns on the bulb) and the
GRAY/BLACK can be directly connected to the wire in the vehicle. If the vehicle uses a positive
wire (12V to turn on the bulb) a relay must be used to change the polarity. (See Finding the Wait-
To-Start Bulb Wire For Diesels section of this guide.) Here are some common colors of this wire:
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Chevrolet and GMC trucks: Light Blue or Dark Blue
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Ford Trucks: Black/Pink
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Dodge Ram Trucks: Orange/Black or Black/Orange
There are some instances of diesel vehicles without WAIT TO START wires. In this case, please
contact Technical Support.
NOTE: A 1-amp diode must be installed in line on the factory wire between the wait-to-start
indicator and the ECM or the glow plugs will stay engaged, draining the battery.
VIOLET/BLACK (-) Selectable Channel 4 Output
LIGHT GREEN/BLACK (-) Factory Disarm/Special Accessory Output
GRAY/BLACK (-) Wait-to-Start Input
H2/1
H2/2
H2/3