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Old 06-10-2009, 01:48 PM   eBay Motors  #1 (permalink)
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trailer brake problems

i have an 05 duramax and cannot seem to get my trailer brakes to work all lights are working... i have a digital reese control box and all that shows is a decimal point i have looked up what that means and it says something wrong with the blue wire i have followed that wire all the way across and cannot find anything wrong ... any suggestion???
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Old 06-10-2009, 02:12 PM   eBay Motors  #2 (permalink)
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Is this a new install? Or did it work and now it doesn’t? If new, do you have the correct brake controller harness to plug in? I believe a single dot means no continuity on the circuit, as in it doesn’t see a trailer hooked up.
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Old 06-10-2009, 02:15 PM   eBay Motors  #3 (permalink)
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IIRC mine did the same thing when I first installed my controller and it was the lack of a BRAKE control fuse under the hood, but then again ive been wrong before.
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Old 06-10-2009, 03:15 PM   eBay Motors  #4 (permalink)
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If it is a new install, you may also ahve simply forgotten to adjust it. I know if mine is not adjusted to apply the brakes then that is what it does.
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Old 06-10-2009, 03:32 PM   eBay Motors  #5 (permalink)
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its not a new install it was working really well......i just checked the under hood fuse and it is working fine... BUT now i have noticed that the left trailer turn/ stop fuse slot as no power...so friggin frusturating keep the input coming please
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Old 06-10-2009, 03:52 PM   eBay Motors  #6 (permalink)
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Fuse good and power to the unit. Next, move to the rear and look for loose terminal posts in the plugs.

Tester available? Lift the cover and Test the output at the trucks plug (reverse of below image from rear). No tester? Pull the head cover back on the trailer end (easiest one 1st) and check for secure terminals there. Then on to the truck's plug, there's a release tab to pull the plug from the plug mount.

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Old 06-10-2009, 04:13 PM   eBay Motors  #7 (permalink)
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Here is my post from my problem several months ago.

My 05 2500HD Crew was having turn signal problems also. My turn signals were all screwy. Sometimes they worked, sometimes they both worked at the same time, sometimes they wouldn't work. Hooking up to a trailer amplified the problem. I replaced the turn signal relay and all problems fixed. The new part number is 10383321. About $95 at the dealer. It is about $100-200 less than the multi function switch. Good luck.

The turn signal relay is....turn on your turn signals and listen for the clicking sound. That is your turn signal relay. Follow the sound.

The turn signal relay in the 05 has a tendancy to fail after a while. Mine worked fine for the first 6 months I owned it and then all of a sudden it started malfunctioning. It is worth looking at.
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Last edited by stukar; 06-10-2009 at 04:36 PM. Reason: Added info
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Old 06-10-2009, 04:42 PM   eBay Motors  #8 (permalink)
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k so i checked the plug and there is no power so i went back to the front and pulled the fuse on 'stud2' which is the trailer brake fuse, where there is no power to the inside post
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