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Please help! Headlights


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A few weeks ago in my 78 w150, everything was working fine and I can back and now my electronics ...


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Old 05-25-2016, 09:21 PM   #1 (permalink)
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Default Please help! Headlights
A few weeks ago in my 78 w150, everything was working fine and I can back and now my electronics are messed up. Headlights won't work, i have positive charge flowing through the headlight grounds, turn signals don't work and its so frustrating. If I turn the headlight switch on (which is brand new I just replaced) the turn signal indicators and tach light up. If I turn the turn signals on, both indicators flash like if the hazards are on and the tach light flashes. None of the exterior lights work though as I have charge flowing through the ground wires. I tore into the dash and wiring harness and replaced the headlight switch and still can't figure it out. All my fuses are good too. Please help me


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Old 05-26-2016, 09:25 AM   #2 (permalink)
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about the only electronics you have is radio and ignition module ,look for in line fuse coming off battery ,try a hot line directly to the switch and trace back from there' If you don't understand wiring it might be time to find a friend or shop to help you out lots of things I would try but a meter and knowledge are your best friend to prevent buring the dodge down'
ps I love old 150 I had a 76 club cab with a mild built 400 ,road runner heads,650 4 bbl and headers ,bought it out of ok ,sent to a friend in tx for the motor and then brought home to mi, it was quick dmv issued my plate it was sl076 and it was anything but slow
brianj


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Old 05-26-2016, 10:02 AM   #3 (permalink)
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Sounds to me like you have an open ground somewhere. I'd look for a corroded or broken ground wire somewhere. Possibly a black wire with a spade lug on it.

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Old 07-23-2016, 01:52 PM   #4 (permalink)
 
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Do you have a tilt wheel ? I chased this issue around on my 91 , I replaced the headlight switch that didn't resolve it either. Hot wired a switch of the headlight switch to power running and dash lights , radio no longer works either.

I now believe its a bad turn / wiper delay/ high beam switch just haven't got around to trying it yet.
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