I installed these towing mirrors on a 2001 Ford F-250 7.3 Diesel 2wd. I am very happy with the installation. The only problem I had was that the mirrors didn't come with schematics. I found a YouTube video that explains the installation but the wires were different colors. With these mirrors, the blue cable is the running light. The white wire is the turn signal. The gray wire is the heater. Black floor. I just attached a ground wire to the door with a self tapping screw. On my 2001 F250 I connected the wires behind the fuse box. White and blue is the right turn signal, yellow and white is the left turn signal. I connected the brown wire behind the light switch for both daytime running lights. I added a switch and circuit for the heaters. Just be careful when turning the mirrors. Tighten in a star pattern, doing a little with each turn to ensure even tightening. Don't overtighten! I am happy with the installation. One star deducted for lack of wiring information.
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