mike rousseau Posted March 1, 2013 Report Share Posted March 1, 2013 So My left turn signal doesn't work at *NIGHT* anymore... Instead if blinking it stays lit... It's a 2005 F-150 FX4 Everything works fine during daylight... And if I turn my lights off (dim) after dark everything works fine... My 4 ways also do not blink after dark... But are fine during daylight.... I haven't done any work to the truck recently.... It just stopped working at night about 2 weeks ago... Any thoughts...??? Link to comment Share on other sites More sharing options...
ecmilley Posted March 1, 2013 Report Share Posted March 1, 2013 while ford has more than enough electrical issues with REm (rear light modules) and similar devices, i would check rear socket for corrosion and bulb condition the contacts on the 3157 bulbs due fail frequently before giving yourself a brain cramp over it. Simple stuff first Link to comment Share on other sites More sharing options...
Bernie Posted March 1, 2013 Report Share Posted March 1, 2013 I agree with Ernie.It's possible a filament in a bulb has crossed over to the signal side from the running lights.Could be front or rear bulb. Link to comment Share on other sites More sharing options...
walleyejigger Posted March 1, 2013 Report Share Posted March 1, 2013 i was having all knids of light issues last year with my '06, i ended up tracing it to the fuel pump relay being badly corroded and damagged. the main wiring harness came to a "T" at the relay and from there seperating to ur rear lights. about 230$ part and 1 minute fix. unplug old one, unbolt it, plug in new one and rebolt, on my truck having it placed directly above the spare tire ends up being a perfect place for road salt to accumulate and wreak havoc prolly not ur issue but good to know Link to comment Share on other sites More sharing options...
craigdritchie Posted March 1, 2013 Report Share Posted March 1, 2013 (edited) Agree, check the simple stuff first. Assuming the truck has auto headlights ..... turn that feature off and turn on full lights manually, as Sinclair suggested. If everything suddenly works fine, then almost certainly a failed ambient light sensor or corrosion somewhere in that system. Very easy to check and either confirm or rule that out. If the problem persists with lights on manually, then I'd check the bulbs on all four corners for corrosion. Edited March 1, 2013 by Craig_Ritchie Link to comment Share on other sites More sharing options...
jedimaster Posted March 1, 2013 Report Share Posted March 1, 2013 could be the harness for your trailer as well, often times they are the root of all things blinker evil Link to comment Share on other sites More sharing options...
mike rousseau Posted March 2, 2013 Author Report Share Posted March 2, 2013 To add more info The cruise also doesn't work at night... Link to comment Share on other sites More sharing options...
Bernie Posted March 2, 2013 Report Share Posted March 2, 2013 The cruise likely doesn't work because the brake lamp circuit is being backfed with power through the signal circuit. Cruise shuts off when brakes applied.Did you check the bulbs and trailer light plug? Link to comment Share on other sites More sharing options...
Muskieman Posted March 2, 2013 Report Share Posted March 2, 2013 same happened to my Expedition, rear brake light bulb, 2$ fix. Link to comment Share on other sites More sharing options...
mike rousseau Posted March 2, 2013 Author Report Share Posted March 2, 2013 The cruise likely doesn't work because the brake lamp circuit is being backfed with power through the signal circuit. Cruise shuts off when brakes applied. Did you check the bulbs and trailer light plug? I'm gunna check mon-tues once I'm done my stretch at work.... Link to comment Share on other sites More sharing options...
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