Installation guide

auxiliary harness (H2) wire connection guide

Connect this wire to the wire in the vehicle that sends the signal to turn on the WAIT-TO-START bulb in the dash-

board. 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:

■ Chevrolet and GMC trucks: Light Blue or Dark Blue

■ Ford Trucks: Black/Pink

■ Dodge Ram Trucks: Orange/Black or Black/Orange

NOTE! A 1-amp diode must be installed in line on the factory wire between the wait-to-start indi-

cator and the ECM. (See the following diagram for details.)

H2/1 GRAY/BLACK (-) diesel wait-to-start bulb input