I have a similar issue. Purchased. 15 high country that has tow mirror. Truck was wrecked before so that may be a cause. The driver side mirror functions properly except the reverse lights on side of mirror. The passenger side mirror is a replacement but has no power to it what do ever heat blinker mirror motor power fold none of that works. I took the mirror off and plugged it into the driver side pig tail and the mirror worked, all except the reverse lights. Anyone else had a similar problem or know a fix? I assume the high country came with tow mirrors as it has a factory button for power folding.