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Finding the wires you need
Important: Do not use a 12V test light or logic probe (com-
puter safe test light) to locate these wires. All testing described
in this manual assumes the use of a digital multimeter.
➤ Obtaining constant 12V
We recommend two possible sources for 12V constant: The (+) terminal of
the battery, or the constant 12V supply to the ignition switch. Always install a
fuse within 12 inches of this connection. If the fuse will also be powering other
circuits, such as door locks, a power window module, or a Nite-Lite® headlight
control system, fuse accordingly.
Important: Do not remove the fuse holder on the red wire. It en-
sures that the control module has its own fuse, of the proper value,
regardless of how many accessories are added to the main power
feed. .
➤ Starter wire
The starter wire provides 12V directly to the starter or to a relay controlling
starter. In some vehicles, it is necessary to power a cold start circuit. A cold
start circuit will test exactly like a starter circuit, but it does not control the
starter. Instead, the cold start circuit is used to prime the fuel injection system for
starting when the vehicle is cold.
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© 2008 Directed Electronics. All rights reserved.
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