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How to find a (+) or (-) parking light wire with your multi meter:
1.
Set to DCV or DC voltage (12V or 20V is fine).
2.
If you are looking for a positive circuit attach the (-) probe of the meter to
chassis ground. If you are looking for a negative circuit, attach (+) probe of
your meter to +12V constant.
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.
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 the meter returns 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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