Ford F-150 - 1997-2003 :: Right Turn Signal / Brake Light Not Working - MFS?
Aug 9, 2017
I have a 1997 F150 5.4L 2wd long bed w/ tow package.
Right (passenger) turn signal/brake light is not illuminating. The tail light on the right side does illuminate when headlights are on. (Same Bulb) All other lights are functioning properly.
When the MFS is in the right turn position the right arrow on the dash flashes and clicks faster than normal.
This happened about a month ago and it turned out to be a blown fuse. The fuse was for the trailer lighting and right turn/stop light, found in the small fuse box under the hood that only holds 2 fuses. Problem solved temporarily...
Now the issue is back, Here are some things I've tried so far:
Replaced the fuse again; Turns out the fuse didn't blow this time, but I tried a new one anyway.
Cleaned the ground for the rear light wiring harness.
Replaced the bulb.
Replaced the relay.
Checked continuity on multi-function switch, right turn position reads 2.8 ohms IIRC
Repaired pin #5 on the multi-function switch wiring connector (wire backed out, right turn related)
Replaced the bulb socket.
Inspected the wiring for broken insulation/exposed wires from that socket to under the hood, didn't find anything exposed. All wires are still in the loom.
I replaced this wiring harness and wiring looms about 6 months ago because the previous owner had done a hideous splice job for unknown reasons, so it should be ok. Should I get a new multi-function switch, or try something else? If the switch doesn't work what's the next step?
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Last week wife's right rear turn signal/brake light stopped working. The left one flashes normally. The right tail light works fine which is a different bulb. I tried changing bulbs (didn't work).....tried a new socket with new and old bulb (didn't work). Could it be a relay? Or not relay as they would be both out (left and right)?
I looked at my trailering wiring plug down by bumper and the white wire with green stripe looks split a little towards the end. Could it be a bad ground or short in that wire? Would the trailering wiring have anything to do with it? I was going to try to replace the relay if I could find it, what is the part number for it.
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