Finding A Light Wire - Directed Electronics 3901V Installation Manual

Finding a light wire

Find a (-) parking light wire
Use the following procedure to find a (-) parking light flash wire with your multimeter:
1. Set to DCV or DV voltage (12V or 20V).
2. Attach the (+) probe of the meter to a fused (+) source.
3. Probe the wire you suspect of being the parking light wire. Usually, the area near the headlight/
parking light switch is an excellent area to start, as is the kick panel. Refer to the directechs.com for
specific vehicle information.
4. Turn on the parking lights. If your meter shows 12V, turn off the parking lights and make sure it goes
back to zero.
5. If it does return to zero, turn the parking lights back on and, using the dash light dimmer control, turn
the brightness of the dash lights up and down. If the meter changes more than a volt when using the
dimmer, look for another wire. If it stays relatively close to 12V, you have found your parking light wire.
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