Question about 2003 Chevrolet Silverado 1500

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Brake lights do not work

2003 silverado - brake lights do not work. trailer hitch light works. Does brake pedal switch wire go straight to the brake lights?

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Have you checked both bulbs , also check closely on all the fuses. if you have to, use a test light and probe all fuses on both sides of the fuses

Posted on Apr 24, 2009

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I just bought a horse trailer and when I hook it up to my 2006 Silverado, the lights don't work. My trailer hitch and wiring system are new, and the previous trailer owner tested the lighting of


Some people wire trailer plugs differently. If the plug is not wired differently than yours, make sure the tow ball is clean. No rust. That's where the trailer gets its ground from. Usually they will work if thats the case, but not right. I can't remember what the wire colors are right now. Go to etrailer and look up the diagram.

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Brake lights stay on. nomatter what. pull fuse-off-not pedal switch.


so then if you unplug the switch on brake pedal the brake lights stay on if so check operation of the hazzards and turn signals could be a short in the turn signal switch or flasher unit also check for pinched wires around third brake light and tail light wireing does your car have trailer hitch ? if so check the trailer plug wireing

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if have trailer hitch - check for bare wires shorted together, if no trailer hitch look inside left frame rail at tail end- harness should come from front of truck to this point then cross over to right side- look for a cut or bare wiring again

May 21, 2010 | 2003 Chevrolet Silverado 1500

1 Answer

Backlights are not working. I checked the bulbs and fuses.


None of the lights work? Reverse/brake/tail lights? If it's all of them, then suspect a module that controls the lights...if it's 1 or 2, check the brake switch @ the pedal. Do you have a trailer hitch w/a wiring harness? That may cause issues.
TD

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1 Answer

Were do you hook up the two wires under the hood for trailer brakes on a 2000 silverado


Sometime around 2000, GM started putting trailering pre-wire harnesses in the vehicle. Your truck may have this harness built in and would greatly simplify brake controller installation. Look under the glovebox and see if there is a wire harness tied off. There will be four wires in this harness, which should be run over to the steering column to use it. Most trailer brake controllers are compatible with this harness.
The four wires in the harness are: Red, 12vdc; black, ground; blue or purple, brake pedal; and brown or white, trailer brake wire to seven pin, four pin, or five pin connector at trailer hitch, if your truck came from the factory with a trailer hitch.
If you are adding the hitch and do not have the four wire harness, the under hood wires from your brake controller are Red, connect to one of the studs under the distribution box cover (the distribution box is on the driver's side against the firewall. Underneath the cover are two large threaded studs which are hot from the battery all the time); and the other wire from your brake controller would have to be run the length of the truck along the frame, tied off in several places, to the trailer hitch connector on the bumper. Follow the directions that came with trailer hitch wiring connector to connect this wire to the proper pin in the connector.
If this has helped you, great, and please remember to vote/comment.
Good luck!

Feb 21, 2010 | 2000 Chevrolet Silverado 1500

1 Answer

Running lights work but no brake or turn on trailer


wires on truckhave a feed ,are they connected correctly??

Feb 10, 2010 | 2003 Chevrolet Tahoe

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Brake lights


If you have an aftermarket trailer towing plug on it, that's where i would look first. Something is shorting out in there, or you have a broken wire or ground somewhere. Proabably near the back where gravel stones can hit.

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No brake lights on a 1996 ford contour ..3rd light and blinkers work fine I have ohm'd out brake switch on pedal and it is good ..blinkers on front and back both work.. no power to bulb socket on brown to...


The brake lights (excluding the 3rd brake light) go through the turn signal switch. It's possible there's a bad connection in the switch causing your symptoms. I would rule out the brake switch on the pedal, considering the third brake light works. Locate a wiring diagram for the brake light circuit, follow the wires into the steering column as far as you can and verify it's getting power up until the turn signal switch and verify no power is coming out of it. Once that's determined it's time to replace the switch.

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1 Answer

I have a 2003 chevy pick up and the electric trailer brake works when I activate the brake controller manualy, but it will not activate the trailer brakes when I step on the brake pedal. I have tested the...


If the brake conrol iis activating by manually moving the slide lever but not with the depression of the pedel the problem is no brake signal you need to have power to the red wire coming into the brake control. One of the two white wires coming from the brake switch is switched power and you could wire in there. A test light and time will fix your problem.

Mar 28, 2009 | 2003 Chevrolet Silverado 1500

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