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© 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 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.
Use the following procedure to find the starter 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 starter wire. The
steering column is an excellent place to find this wire.
Remember you do not need to
interrupt the starter at the same
point you test it. Hiding the
control module and connections is
always recommended.
4. Turn the ignition key switch to the start position. Make sure
the car is not in gear! If your meter reads (+)12V, go to the
next step. If it doesn’t, probe another wire.
5. Cut the wire you suspect of being the starter wire.
6. Attempt to start the car. If the starter engages, reconnect it
and go back to Step 3. If the starter does not turn over, you
have the right wire.
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