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8 © 1999 Directed Electronics, Inc. Vista, CA
finding the wires you need
Now that you have decided where each component will be located, you’re going to find the wires in the car that
the security system will be connected to.
IMPORTANT! Do not use a 12V test light to find these wires! All testing described in this manual
is described using a digital multimeter.
We recommend two possible sources for 12V constant: The (+) terminal of the battery, or the constant supply to
the ignition switch. Always install a fuse within 12 inches of this connection.
IMPORTANT! Do not remove the fuse holder on the red (H1/11) wire. It ensures that the control
module has its own fuse, of the proper value, regardless of how many accessories are added to the
main power feed.
The ignition wire is powered when the key is in the run or start position. This is because the ignition wire powers
the ignition system (spark plugs, coil) as well as the fuel delivery system (fuel pump, fuel injection computer).
Accessory wires, on the other hand, lose power when the key is in the start position to make more current avail-
able to the starter motor.
How to find (+)12V ignition with your multimeter:
1. Set to DCV or DC voltage (12V or 20V is fine).
2. Attach the (-) probe of the meter to chassis ground.
3. Probe the wire you suspect of being the ignition wire. The steering
column harness or ignition switch harness is an excellent place to find
this wire.
finding the 12V switched ignition wire
obtaining constant 12V