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Old 03-29-2008, 06:05 PM   #1
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1966 17' Caravel
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GMC brake controller issues

Hi All

We are about to start traveling for several months next week. We are in the middle of packing up out house and sorting out the trailer. Anyhow, I had one job I had been putting off and putting off, installing a brake controller in my new truck: a 2000 GMC Sierra k2500 SLT. Anyhow, everything I read made this sound like a simple question of plugging the provided plug into the back of the prodigy and into the GMC junction box next to brake pedal, see for example, The truck came with a factory install tow package, so I should be good to go, right?

Well alas, I climbed under the dash today and (of course) the junction box looks totally different (I think).

My question is this; Where on earth do I connect the controller to? I assume there must be a plug for it somewhere as I have a 7pin factory installed tow package, but I can darned if I can find it? Does anyone have a truck like mine? Can someone help me? We are getting close to setting off time and I have no brakes !

Any help much appreciated, thanks!


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Old 03-29-2008, 06:08 PM   #2
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Forgot to post pic, here it is.
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Old 03-29-2008, 07:37 PM   #3
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I have a 1999 Silverado. It may be the same. Mine is the second spot from the left on the top row. Mine has a diagram on the inside of the cover which shows TRL.

On mine there was a large fuse, don't remember which amperage, which goes in the fuse panel under the hood. The fuse was taped together with the wire harness. Don't remember which spot, but if you post the amperage of the fuse, and a picture of your under-hood panel without the fuse, I should be able to tell you which spot.
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Old 03-29-2008, 08:25 PM   #4
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My '06 Sierra had a pigtail in the glove box. That didn't plug into a board like your picture. The female plug and associated wires for the pigtail was tucked high up under the dash. It was less than obvious and my GM mechanic followed the computer schematic and was surprised how far up it was tucked.

Then it was a matter of determining wire function and connecting the bare ends of the pigtail to my brake controller. It's not hard but they don't make it immediately obvious.

5 meter Langford Nahanni

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Old 03-31-2008, 09:24 PM   #5
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1985 25' Sovereign
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It seems that some 2000 GMCs came prewired for a controller the rest don't. However, by 2003 they were all prewired. As I'm running out of time before we start our journey, I'm just taking to a trailer mechanic tomorrow to get it installed for me (150 USD, ouch!).

FYI, if you have questions about your truck, try posting to, I got several very helpful responses including some info about recalls associated with trailer wiring and full wiring diagrams.

I'll post another thread explaining what we are doing.
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