I took my driverside door panel off today to check the wiring. I had 4 wires running to the connector, 3 going to the mirror. The black wire according to the book is a ground. There are 4 pins in the connector in the door and 3 in the mirror connector. I did a voltage test on the 4 pins and only 3 are hot. Shouldn't the ground go to the mirror not stop mid stream if it's a ground. I wonder if this could be used to heat them ?
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