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Is there a 12v lug under the dash 2001 sierra pu to hook up trailer break

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No . . .

Posted on Apr 28, 2017


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I have a 2009 GMC Sierra with towing package and a 7 pin plug on the rear bumper. I hooked up a new trailer with electric brakes and the display on the dash shows "trailer connected" and shows increasing...

It's a very good possibility that it is the trailer. You say that it is new, is it a brand new trailer or just new to you? If it is brand new, and you bought it from a place that deals with trailers, then I would say take it back and have them look over everything. If that's not an option, then it's time to pull out the circuit tester and start checking wires. See if you are getting power to the Blue wire on the trailer, and if so is there power all the way to the brakes. You will need someone to push on the brake pedal while checking the wires. If the power is good all the way to the brakes, then you will need to pull the drums and inspect the brake shoes for wear, and condition of the the brake components. If this is a used trailer, then it would be a good idea to do this anyway so that you can also inspect and grease the bearings. If everything looks good, then the brakes might just need to be adjusted via the slot on the back side of the brake housing. If no power is seen in the blue wire, check the Red wire (12v Aux/charging), if it doesn't have power, then you more than likely have a Ground issue. This can easily be checked by hooking the trailer to the truck (hitch). Both use a chassis ground, and will use the hitch itself as the ground connection, though it is not a good idea to use it as the ground point.

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2001 gmc sierra rear pillar speaker setup. So I hooked up rear 4x6 speakers in the stock location. From the factory it didnt have rear speakers and when I hooked these up to the factory wires l dont have...

I would guess that GM didn't hook these wires up to the factory stereo, as the factory stereo may not have the front back fade feature. They put the wires in to save you time if you decide to put another stereo in. Look under the dash, you will probably see the other end there. I'm not sure about this. Just a guess, but my tractor trailer is set up that way, and I only have 2 speakers, but wires are run to all possible speaker sites. Good luck.

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The very complex diagram shows it is apparently 20A FUSE 18 in the central junction box.

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There is another fuse box under the hood. Driver side. Check it out.

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All late model gms have a seperate fuse for trailer lights in the under hood fuse box. Your truck running lights will still work but no trailer lights

Feb 13, 2011 | 2001 GMC Sierra 2500HD

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We are trying to wire in tailights and brake

Under the frame, your Sierra has a trailer harness. Locate it and hook up your trailer harness to it, every Sierra has a factory harness hook up in it, here is a link of your wire harness should be located under your Sierra.
Thank you for using fixya and good luck.

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When I hook up my trailer all the break lights,signal lights stop

sounds like the adpater to the hook-up is bad. or your grounds arent completely grounded. thats where i would start before rewiring the trailer.

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05' Sierra 1500 trailer break lights

try This should help. Make sure the lights and trailer are grounded. Especially with a tilt trailer. The tilt pins carry the ground. Run a ground strap from the frame to the bed.

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Looking for plug under dash to hook aux trailer brake controler

The connector is located under the dash on the left side of the steering column. Their is a box, remove the cover and starting from the top left the second connector location moving to the right is the one to hook into, make sure that you have the correct wiring harnass adapter for the vehicle, their are two different ones for GM trucks. On the inside of the cover is also a diagram of the lay out of the box.

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