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7
finding the 12V switched ignition wire
The ignition wire is powered when the key is in the run and start position. This is because the igni-
tion wire powers the ignition system (spark plugs, coil) as well as the fuel delivery system (fuel pump,
fuel injection computer). Accessory wires lose power when the key is in the start position to make
more current available 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 steer-
ing column harness or ignition switch harness is an excellent
place to find this wire.
4. Turn the ignition key switch to the run position. If your meter reads (+)12V, go to the next step.
If it does not read (+)12V, probe another wire.
5. Now turn the key to the start position. The meter display should stay steady, not dropping by
more than a few tenths of a volt. If it drops close to or all the way to zero, go back to Step 3. If
it stays steady at (+)12V, you have found an ignition wire.
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