Chevy/GMC Duramax 01-04 LB7 Discussion of Chevy and GMC Trucks with LB7 Duramax Turbo Diesel Engines

Juncion Block Body - No Power

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Old May 18, 2008 | 03:00 PM
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2500HeavyDuty's Avatar
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Default Juncion Block Body - No Power

Im trouble shooting my brake light problem and i haven't been able to find any blown fuses as of yet.

While i was testing for a hot wire i was just checking on the junction block body and i was making sure i had a good ground so i tapped the connector for the Cell phone ready connection and something blew and the hot wire for it is not working any more.

On my brake controller wiring harness the only wire that gets hot out of all them even with the brake depressed is the 12v supply wire.

On the trailer only the running lights work and in the fuse block the turn signal fuses for the trailer are getting power but it doesn't reach the trailer.



Ive been looking in my service manuals and ive check all the fuses that are related to my problem and found nothing so far.
 
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Old May 19, 2008 | 07:49 AM
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you could have a pinched wire i had that happen on my 03 from the factory had a pinched wire under the bed everything was fine and the only thing i had was running lights it was under the bed so you may want to start following the wires back to the rear of the truck and test the wires every couple feet
 
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Old May 19, 2008 | 01:16 PM
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Funny thing was, there was a fuse that blew and i replaced it, but my brake controller wasnt workin.

so i kicked it after getting mad at it and it started working again
 
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Old May 20, 2008 | 04:47 PM
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Kicking it Works ? WOW ive tried that a few times w/ no avail
 
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Old May 20, 2008 | 11:29 PM
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worked for me
 
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Old May 24, 2008 | 05:27 PM
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Maybe you forgot a part in your pocket again Danny?
 
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Old May 24, 2008 | 05:51 PM
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nope not this time, i could loose a few parts though, makes the truck lighter
 
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