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1948 - 1956 F1, F100 & Larger F-Series Trucks Discuss the Fat Fendered and Classic Ford Trucks

Very weird electrical problem with tail lights. HELP

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Old Oct 29, 2017 | 06:26 PM
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Unhappy Very weird electrical problem with tail lights. HELP

Hi all , greetings from London, UK .

I've got my 55' f100 with 292 y block from North Carolina earlier this year. It has been converted to 12V and has the original wiring all around.

Overall very good truck , i've done just little things on it to make it better.

However , yesterday the brake lights and blinkers stopped working all of the sudden. Just the running tail lights were working.

I changed the old wiring with new connectors and wires and all started working again apart from the driver side brake light ( blinker and running light was fine). Then I changed the ground wire and hurrah, all worked.

They all worked but i never started the truck , all the tests i did were done with the truck off , just the ignition on and light switch on.

When i started the truck , NOTHING . Only the passenger blinker worked , thats it.

Any ideas what might be the issue ? Btw I just found out that the battery is grounded to the chassis instead of the engine.
 
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Old Oct 29, 2017 | 06:30 PM
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CharlieLed
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No such thing as "grounded to the chassis INSTEAD of the engine"...go back and install bonding straps to the chassis, body, and engine. All three need to be grounded together. You cannot install TOO many bonding straps!
 
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Old Oct 29, 2017 | 06:37 PM
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Ok , will do. Will give feedback if problem solved
 
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Old Oct 29, 2017 | 07:36 PM
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For the majority of times, most any electrical problem can be traced back to a faulty ground circuit.
When you add the additional ground straps take a few minutes to scratch/grind/etc the paint off in the area where the strap goes. You want good metal to metal contact. It's also a good idea to use those star type lock washers as they "bite" into the metal pretty good


.


Good luck, I hope you get the lights working so that you can go drive it around and enjoy it.
Bobby
 
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