8
© 2 0 0 5 D i r e c t e d E l e c t r o n i c s — a l l r i g h t s r e s e r v e d
finding the accessory wire
An accessory wire will show (+)12V when the key is in the acces-
sory and run positions. It will not show (+)12V during the
cranking cycle. There will often be more than one accessory wire
in the ignition harness. The correct accessory wire will power the
vehicle's climate control system. Some vehicles may have sepa-
rate wires for the blower motor and the air conditioning
compressor. In such cases, it will be necessary to add a relay to
power the second accessory wire.
finding the parking light wire
Most vehicles use a (+) parking light circuit. The (+) parking
light wire is often found near the light switch. In many vehicles
the light switch is built into the turn signal lever; in these vehi-
cles the parking light wire can be found in the steering column.
The same wire can often be accessed in the kick panel or running
board.
How to find a (+) parking light flash wire 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 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 it does return to zero, turn the parking lights back on
➜
➜
