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Tailights 76 f100

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Old Jun 6, 2013 | 01:28 PM
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Tailights 76 f100

I have a 76 f100 stepside and have a mess involving the wiring .
My problem right now is taillights and the fuse box. Are the brake lights and taillights on the same circuit? I have brake lights and no taillights. Any help would be appreciated.
 
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Old Jun 6, 2013 | 01:59 PM
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The other half of this diagram can be found in the tech info hyperlink sticky.

 
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Old Jun 6, 2013 | 02:40 PM
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I seem to have something weird going on.i was making progress checking circuits and gaing ground on it.Now I get nothing with test light on any circuit. Test light works engine starts turn signals work brake lights work but nothing tests with light as working.whats up?
 
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Old Jun 6, 2013 | 03:35 PM
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Did the you blow the bulb in the test light?
 
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Old Jun 6, 2013 | 03:39 PM
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Nope test light is good.
 
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Old Jun 6, 2013 | 04:40 PM
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Ignore this post.
 
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Old Jun 6, 2013 | 04:43 PM
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Thanks for the info.
 
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Old Jun 6, 2013 | 05:00 PM
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Please accept my apology; my brain logged out for a few minutes. They are NOT on the same circuit; I gave you incorrect information and have since deleted my original post.

The brake lights are protected by the fuse panel; the tail lights are NOT. The tail lights are part of the running light circuit, which is protected as a whole by a circuit breaker internal to the headlight switch.

Do the rest of your running lights work (front parking lights, side market lights)?

What do you mean you're having a problem with the fuse box? What's the problem?
 
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Old Jun 6, 2013 | 05:26 PM
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Well i could take mt test light and get all circuits to test.Then nothing tests out but have turn signals and brake lights and engine starts
 
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Old Jun 6, 2013 | 05:42 PM
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I don't understand what you're saying.
 
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Old Jun 6, 2013 | 06:18 PM
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Why would one minute i can test the circuits with the light and they test fine.Next minute nothing tests out to work but some things work.
 
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Old Jun 6, 2013 | 06:20 PM
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You need to be more specific about what "test out" means, and what the "circuits" and "things" are. I should be able to replicate your exact measurement on my own truck without any confusion. As of now I have no idea what you're doing.
 
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Old Jun 6, 2013 | 06:33 PM
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If I take a 12 volt test light and touch it to the terminals in the fuse block the light lights up.Then for no reasoncant get any terminals to make test light work, but i have some things working.
 
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Old Jun 6, 2013 | 07:20 PM
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It almost sounds like you have a problem with the test light.
 
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Old Jun 6, 2013 | 08:09 PM
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I would normally agree but when I check it n the battery it works fine. Could it be a grounding problem?
 
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