Dandy. Start the engine, then momentarily touch that wire with no voltage to either of the other two. That's easy to do with a stretched out paper clip or a needle nose pliers. Just touch the two wires in the plug together for an instant. If the head lights are on you'll see them brighten up and the generator will keep on working until you stop and restart the engine.
The smaller wire with 12 volts is where the voltage regulator monitors system voltage. The other one is the turn-on signal for the regulator. It comes from the battery light on the dash. If you have only a gauge and no light there is a resistor on the cluster to take the place of the light.
Once the unit is working you will find 12 volts on the wire where voltage is missing now. That is what normally turns the dash light off right after the engine starts.
Sunday, April 7th, 2013 AT 11:02 PM