Dandy. I'm not a fan of auto-ranging meters. I have over a dozen digital meters for tv and car radio repair, and most cost less then 40 bucks each, and none are auto-ranging.
Pop the driver's switch assembly out and look for the orange / black wire. That one, it appears, should have 12 volts all the time. If it does not, I'll have to search through the wiring diagrams to see where it comes from. Use something on the body, like an unpainted bolt head, for the ground for your meter.
If you have that 12 volts, move the meter's ground lead from the body to one of the black wires in that plug. If you still find 12 volts, move the ground lead to the other black wire and try again. Something there has to be missing. If you have all those 12 volts, measure again with a test light or while you're activating the switch one way or the other. We're still looking for one of those voltages that is missing. If one goes missing only when under load, (activating the switch or when using the test light), there is a break in the circuit and a carbon track has been left behind. Carbon tracks will pass just enough current for a digital voltmeter to falsely say the circuit is okay. This is where a test light can be more accurate.
Wednesday, February 18th, 2015 AT 2:04 PM