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The owners manual for my 07 Yukon XL says that the guage will fluctuate both high and low. As was previously mentioned, I think the high amperage alternator (160 amps) charges with bursts of power. When towing my travel trailer in rain for four hours last week, I noticed it stayed on the high...

Get out your owners manuel and look for fuses and fuse locations for back up lights. Then test the fuse. Oh, buy the way are your vehicle back up lights working when put in reverse? Dean

Do you have voltage at the center pin on the 7 pin plug when it is in reverse? If you have both wires hooked up then maybe it is one of those two fuses. Dean

Look between the circuit panel box and the brake lines coming from and under the master cylinder. That's where I found my other wire. Dean

I agree. It would be nice if we could just wire it so the dash lights would be ON all the time. Dean