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Tail Light Issues

Old Apr 22, 2020 | 08:34 AM
  #1  
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From: El Dorado, AR
Tail Light Issues

I have a 2012 F-150 that has been acting like the rear left tail light needs a new bulb, fast blinking when used, and will not light up when braking or locking. The light comes on when the headlights are on, but will not brighten for turning, braking, or I use the key fob to lock the truck. I've replaced the bulbs, replaced the blade fuse that is under the glove box for that tail light, and still does the same thing. Both filaments are working, just not brightening. Any ideas?
 
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Old Apr 22, 2020 | 09:37 AM
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Could be . . . poor ground and taillight filament is grounding through signal/stop filament circuit.
Pull socket from housing and check if both are lit,

just a thought.
 
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Old Apr 22, 2020 | 12:15 PM
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You might want to try the module reset procedure at 2:20 in this video. Also follow the relearn procedure so your vehicle will relearn.
 
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Old Apr 23, 2020 | 07:41 PM
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This may sound silly but, did you replace both bulbs in the tail light? I just had one in my '10 that looked like it was operating fine and I did have hyper flash like it would when blown. It was the other bulb that was causing the issue.
 
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Old Apr 24, 2020 | 08:33 AM
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Originally Posted by tiny1
This may sound silly but, did you replace both bulbs in the tail light? I just had one in my '10 that looked like it was operating fine and I did have hyper flash like it would when blown. It was the other bulb that was causing the issue.

Yup, electronics have changed even the simplest things so much. Used to be when a bulp went out the flasher would just stay on. Now the remaining bulb hyper-flashes.
 
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