Directed Electronics Viper ESP 540 Guía de instalación descargar pdf (Pagina 15)

Finding the 12V switch ignition wire

The ignition wire is powered when the key is in the run or start position.

This is because the ignition wire powers the ignition system (spark plugs,

coil) as well as the fuel delivery system (fuel pump, fuel injection comput-

er). Accessory wires, on the other hand, lose power when the key is in

the start position to make more current available to the starter motor. Use

the following procedure to find (+)12V 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 steering

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 doesn’t, 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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Directed Electronics Viper ESP 540 Guía de instalación Pagina 15