F-250 Super left rear blinker and brake light not working. Need help.

20

Asked by Dec 13, 2012 at 04:30 AM about the 2005 Ford F-250 Super Duty XL 4WD Crew Cab SB

Question type: Maintenance & Repair

Left rear blinker and brake light not working.  Front left blinks fast.  Running lights work OK.  Factory installed tow controller.  Trailer brake and blinker on left side pin do not work either.

I get no power on left blinker trailer pin or in light socket on truck.  Bulbs are good and even replaced.  Wiring harness looks excellent everywhere.  Have checked fuse under dash, it is good.  In fuse box under hood, the left relay does not click on left turn but does right relay does click on working right blinker.  Also stabbed wire at rear of truck before it splits and no power there for blinker or brake on left side.  Also checked grounds, they are OK.

Under the hood in fuse box, I checked power in trailer relay socket for left side.  One pin of socket is solid on, other pin sockets are dead.  The right side relay has one socket solid on and another blinks with right blinker as it should.  Fuse there is also good.

I am inclined to think it is either a bad (open) wire on the end of a wire harness after fuse.  The open wire thing is hard for me to believe because harness is intact and has not been disturbed at all.  

Any suggestions would be appreciated.  I am at my wits end on tracing this.  Can the blinker switch on steering column go bad and cause this problem?  Can one test the blinker switch on column or bypass to check if wiring is good?

10 Answers

215

It sounds like you have replaced just about everything. I had this problem with an old pontiac and it turned out to be the actual blinker switch on the steering column. If all your flashers are good, bulbs are good, relays are good, it may be the actual blinker switch

2 of 2 people found this helpful.
90

2011 ford f250 just found a broken wire on the firewall (rubbing against the steel)under the intake box, was the problem with left rear turn signal !

9 of 9 people found this helpful.
30

check the plastic wrap on the wire harness that feeds the light and look for a crease. remove plastic wrap to a point below crease. solved this problem on both my 2000 and 2005 f250s after changing left rear brake light several times.

1 of 1 people found this helpful.
100

So what was the fix? I have the same problem on a 2011 f350

5 of 5 people found this helpful.

i have the same problem on my 2011 f350 lariet

20

Ended up taking to dealer. Could not find the problem myself. Cost about $800 to fix a bad wire in harness and of course not under warranty. Big ripoff.

1 of 1 people found this helpful.
100

I'm gonna take mine in and flash modules. 100 bucks. Hope it works. Where was your broken wire at? By chance was it in between the two fuse panels?

20

Didn't find out where it was bad. Sorry.

Just repaired the same problem on an 07 and found a bad connection in the harness plug under the coolant tank below the fuse box

20

I just had the same problem. 2011 F-450. Chased it all the way back the the body control module. Replaced the body control module and it solved my problem. Hope that helps

2 of 2 people found this helpful.

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