RLXXI

Did you split open the rubber boot between the door and the cab body to check for chafed wires inside?

benchwarmer4203

I should've already asked you this; but didn't think about it until now...are both of your mirrors power? If so, does it kick the fuse when you try to operate boths sides, or just one side or the other?

RLXXI

If one mirror is powered the other will be also, it's not like seats, but good question to ascertain which side might be shorted. Unless it's in the harness at the drivers door, because no matter which mirror you select it will blow the fuse if shorted.

NGM

Aww just throw a piece of wire in there when the smoke comes out you found your short..

Ok maybe that did not get the laugh I wanted and I know once you let the smoke out you cannot put it back in.

If it were me I would unhook the mirror motor and try moving the switch and see if it still blows the fuse. If not the motor may be shorted to ground. If the fuse still blows I would look for a chafed wire after the switch, since the switch always has power to it and the fuse does not blow until it is used.

Just my .02 good luck. If I can do anything else to help let me know.

Frank

RLXXI

You might be surprised that is what we call a smoke test.

It's not the best way to find a short obviously but it is sometimes the ONLY way.

Just make sure you have fire watch available.

NGM

I had to do that one time after 50 hours working on a Mack truck trying to find a short. I found it!! One expensive wiring harness later the truck was fixed.

Frank

benchwarmer4203

I figured that; but I didn't want to assume since I've never owned that MY F150.

Jabbatee

When I took the driver's side door panel off for the second time to check the rubber boot that that carries the bundle of wire from the door into body, I noticed that the wire that runs to the door courtesy light was not inserted into the lense housing. Turns out that the bulb was badly broken with the filament exposed and jammed against the door frame...this is what was apparently grounding out the circuit. Replaced the bulb, secured it into the housing, and the problem was fixed.

Again, thanks to all of you for the help!

NGM

AWESOME, glad you found the issue. Weird that it would only blow the fuse when you used the mirror though. Oh well at least you found the problem.

Frank

RLXXI