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1980 - 1986 Bullnose F100, F150 & Larger F-Series Trucks Discuss the Early Eighties Bullnose Ford Truck

Weird brake light issue

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Old Jun 15, 2017 | 12:04 PM
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Weird brake light issue

Yesterday, the right rear brake light was stuck on ( just the right) and the right turn signal wouldn't work, no attempt...not even the flasher. Today, I put a new bulb in and turn signals work, brake light is unstuck but doesn't illuminate when the brake is pressed. Left side is working perfectly. Tried another new bulb and had the same result. Just for grins, I put the original bulb back in and had the same original problem. One bulb, the brake light doesn't work and another bulb, it's stuck on. Even tried reseating the connector. Anybody ever see anything like this before I break out the ohm meter and start chasing wires?
 
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Old Jun 15, 2017 | 01:46 PM
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If the turnsignal works, that tells me the wiring and the bulb are good from the steering column all the way back. I believe you have a turnsignal switch problem. That is where the brake signal and the flasher signal get mixed together and sent to the rear. The brake and the turnsignal use the same wiring and the same bulb filament in the back.
 
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Old Jun 15, 2017 | 02:06 PM
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That makes sense, for now the issue has magically fixed itself but I'll get a new turn signal mechanism anyway. Just strange how the issue changes by just Changing bulbs.
 
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Old Jun 15, 2017 | 03:27 PM
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Are they LED bulbs?
 
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Old Jun 15, 2017 | 03:47 PM
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No, standard 1157 bulbs
 
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Old Jun 16, 2017 | 06:49 AM
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If it happens again move the turn signal switch back and forth a few times and check again.
Dave - - - -
 
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Old Jun 16, 2017 | 08:03 AM
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Emergency flasher button/contacts are built into this switch/circuit also. You can bounce it up and down 3 or 4 times and see if that makes it better.
 
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Old Jun 16, 2017 | 11:39 PM
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Originally Posted by FuzzFace2
If it happens again move the turn signal switch back and forth a few times and check again.
Dave - - - -
Yep, it's definitely the turn signal mechanism. Started acting up again tonight on my way home from work. Wiggled the turn signals and the right brake light came back. I'll be ordering a new switch tomorrow.
 
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Old Jun 18, 2017 | 05:49 PM
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Originally Posted by Tailbreaker
Yep, it's definitely the turn signal mechanism. Started acting up again tonight on my way home from work. Wiggled the turn signals and the right brake light came back. I'll be ordering a new switch tomorrow.
If the truck has been setting for a bit the contacts can get a film on then and cause issues.


You can try to spray contact cleaner in the switch and work it left & right to see if that will buy you some time before you have to change it out.
Dave ----
 
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Old Jun 18, 2017 | 09:22 PM
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^^^^^ This; or physically clean up the contacts; I used, hmmm, either a Scotchbrite or some very fine sandpaper on mine, been working fine ever since.
 
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Old Jun 19, 2017 | 08:40 AM
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Thanks for the tips!! I'm going to change out the switch.
 
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Old Jul 20, 2017 | 03:08 PM
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Just to close this thread out, it was the turn signal switch. I finally got around to changing it out today and everything works as it should now. Thanks to everyone that helped out.
 
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Old Jul 20, 2017 | 03:12 PM
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By the way if anyone needs a new switch, they are only $24.30 at carparts.com. Part number ARBF504303

http://www.carparts.com/results/?sea...core=1.4632962
 
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Old Jul 20, 2017 | 06:32 PM
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Great! Thanks for the follow up.
 
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