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Generation 6 1973-1979 F100, F150, F250, F350

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  #1  
Old 04-25-2017, 02:53 AM
HoldFast HoldFast is offline
 
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Stumped need help with a bizaar problem

I recently rewired the brake lights turn signal and running lights. Everything works great till i start the truck then the only thing that works is the right turn signal in the left position. New turn signal switch. Need help . could it be because im running a 130amp alt?
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Old 04-25-2017, 07:53 AM
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Fellro Fellro is offline
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Alternator has nothing to do with it unfortunately or fortunately, depending on your view point. But it sounds like the key on feed is in the wrong place. When you test it, do you test the turn signals with the key on?
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Old 04-25-2017, 09:15 AM
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Yes everthing works with the key on but not when its running
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Old 04-25-2017, 10:55 PM
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That is quite odd for certain. I wouldn't think the ignition switch would be the culprit, but possibly could be. Not much else makes sense.
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My trucks:
The workhorse, 86 F250 4x4 6.9 nat aspirated, 3.25 exhaust, custom intake, electric fuel pump, otherwise well used stock... not real pretty but just loves to work!

The other heavy hauler, 92 F350 2wd dually crew cab, flatbed/toolboxes, 92 Cummins VE 12V with intercooler, NV4500 manual

The beater: 88 F250 4x4, 5.8 5 speed
The project ... 1978 F150 4wd shortbed 351 auto

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Old 04-28-2017, 05:59 AM
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Did you use Accy on the switch, or run?
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Old 04-28-2017, 09:52 AM
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Strange issue for sure

Where all did you do work on the wiring?

If you didn't touch anything under the dash, and just ran new harness from under the hood to the lights, I'm going to lean toward ground issues. I've seen all kinds of inexplicable lighting behavior that ended up being poor ground or electrical connections.
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