Question about 2005 Chevrolet Silverado

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Right side trailer brake light does not work

I have a 2005 Chevrolet 2500HD pick-up with Duramax Diesel. The trailer connection is a typical 7 prong receptical. When I apply the brakes, the brake lights on the truck come on but the right rear trailer brake light does not come on. The problem is with the truck, not the trailer. Using a test lamp I find there is no electrical current for the right side trailer brake light at the recepticle where the trailer wiring harness plugges in. In fact, as I trace the towing wiring harness all the way forward and under the hood, I still have no power for the right side brake lamp. I removed the fuse box cover under the hood and actually lifted the fuse box out of it's holder/bracket exposing the mass of wires underneath. It was at this point that I decided to seek some additional help. I managed to fine one wire (dark blue) that lights the test lamp when the brakes are applied. This wire runs to what appears to be a relay. Is it possible that a relay can be the problem here? If so, which relay would it be and where is it located in relation to the others in the fuse box? I do not have a wiring schematic of the truck so I don't know what color of wire to look for that may be causing the problem nor to which of several relays that it may be running to. The wires coming from the firewall (and the brake peddle switch) to the fuse pannel are a different color than the ones leaving the fuses and relays. Thank you for your help.

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  • smartwrench1 May 11, 2010

    did you check the light module under the rear of the truck it controls all of the trl lights and tail lights these are a common failure item on chevy's

  • Dar
    Dar May 11, 2010

    Doesn't the trailer connection run to the same wire that runs the brake lights on your truck? If you have brake lights on your truck, the truck isn't the problem. It's either your receptical, or the wiring to it, or the wiring or on your trailer.

    Is this a factory plug in or an after market?

  • Mike Butler
    Mike Butler May 11, 2010

    My guess is that the blue wire you found is for trailer brakes. Does / is your truck wired for a trailer with brakes? I would also check in both fuse panels as some vehicle use a separate fuse for right & 1 for left signals in some cases, as well as brake. Does that same one come on when brakes applied?

  • exhaust pros Nov 29, 2012

    I have repaired this problem before there is a trailer control module on the back of the fuse pannel in the dash We traced there by test light on the 2 trailer fuses in the front of the pannel we were getting the same results there as the trailer was brake and turn on the left side and only turn on the right side remove the lower pannel of the driver side dash for easier access its a black box that just plugs in


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Did yo check the fuse panel inside the truck its located on the drivers side dash , you have to open the driver side door, in there is a 10 amp fuse that is linked to rt trailer brakes and rt turn signal for the trailer, if the fuse is good there is a black box under the dash located on the floor on the driver side, just to the left of the break, thats where must of the plug in wire harness is for the trailer breaks!

Posted on Jun 10, 2009

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I have a 2005 chevy silverado and is trying to hook up my reverse camera so that the led on the camera turn on when i put the truck in reverse any help?

Posted on Aug 29, 2010

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Posted on Jan 02, 2017

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SOURCE: Park Brake Adjustment

Park Brake Adjustment (Disc Brake)

Tools Required

j 21177-A Drum-to-Brake Shoe Clearance Gage

Park Brake Shoe Adjustment

Caution: Refer to Brake Dust Caution.

Important: The park brake shoes must be adjusted before the park brake cable tension is adjusted.Set the J 21177-A so it contacts the inside diameter of the rotor

  1. Position the J 21177-A over the shoe and the lining at the widest point.
  2. Turn the adjuster nut until the lining just contacts the J 21177-A. Park brake shoe to brake rotor clearance: 0.6604 mm (0.026 in)
  3. Repeat steps 1-3 for the opposite side.
Park Brake Cable Tension Adjustment

Important: Before you adjust the park brake cable tension, verify that the park brake shoes are adjusted to provide a clearance of 0.6604 mm (0.026 in) and the rear disc brake rotors are installed.

  1. Verify the self adjuster lock-out pin has been removed.
  2. Fully apply and release the park brake pedal 3 times.

Posted on Feb 22, 2009

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SOURCE: where are the computer's on a 2004 2500hd duramax

it should be some where in the front of the truck on drivers side..down next to the frame..they move them so much but it will be in that area..hope this helps you and repost if no luck..have a great night

Posted on Apr 02, 2009

  • 1 Answer

SOURCE: Duramax Shuts off at 1000 rpms

I had the same problem and it ended up being the EGR Valve that was sticking.

Posted on Apr 28, 2009

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Take a 12 volt test light... the kind that has a spring loaded clip to hold the probe into the wire, and insert it into the wire just before the trailer plug, vehicle side. (Blue I think) If there is a connection, the brake should see it and you should have an indicator light. When you activate the brake the test light should lite up. If not, move up to the brake actuator and test the blue wire. If there is nothing at the actuator, check the black wire. It is power to the controller. If no power there, check fuses again. If it does pick it up at the plug, connect the trailer and test the trailer itself. First ground to the trailer and then to the truck. Most problems are ground wire related. Then move to the axle and test it there. For the brakes to work, and even show on the indicator, there has to be a ground and power to the brakes themselves. There are 2 wires to each brake... a ground and a power. Test across both wires to make sure you have power and ground. You can also hook another trailer to your truck or another truck to your trailer. Lights can work through trailer ball ground. Brakes can't. leave the trailer unhooked from the trailer and hook the wiring up and test the lights. That usually will indicate a good or faulty ground. Also make sure there is a GOOD ground to the truck frame/body. Also try They have a great website with lots of info. Hope this helps. Mike

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2 Answers

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2 Answers

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