20 © 2000 Directed Electronics, Inc. Vista, CA
secondary 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 wire 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 Wires You Need 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
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