Question about GMC Sierra 1500

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1998 gmc sierra brake lights

My third brake light works but i have no rear brake lights but ido have turn
signals.i have replaced the multi function switch and checked the fuses

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  • flhebert Oct 12, 2008

    I have the same exact problem with by 2000 GMC. Blown fuses.
    Brake, Turning signals work. 3rd brake light &
    running lights also work.



    Still looking for solution.



  • Anonymous Mar 25, 2014

    power at stop light fuse but not rt brake or lt brake light fuse
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After two hours of checking bulbs, sockets and wiring, I found my licence plate light was burned out. Replaced it and my brake lights now work. No one can believe that this was the problem but it worked for me!!!

Posted on Oct 03, 2009

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Did u check that they not burn?if not you should Check the wires going into the steering column if you don't have separate turn signal lights and brake lights because if they use the same bulb then the turn signal may be bad. If I remember correctly that particular car doesn't work this way, but I include it just in case.

Posted on Jun 29, 2008

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1 Answer

Where is the brake relay on a 2001 gmc sierra.


Try wiggling the hazard light switch while pressing on the brakes.The taillights are connected to the turn signal switch before it goes to the brake switch.The contacts on the hazard switch are probably dirty(I remember this problem years ago,same symptoms-3rd light works but l/R tailights not working).You may just be able to turn the hazards on+off a bunch of times to clean the contacts instead of replacing the switch.

Jun 13, 2012 | 2001 GMC Sierra 1500HD

1 Answer

Is there an adjustment for the stop light switch on a 99 GMC Yukon. I have replace it and my brake lights still do not work. Park lights work fine.


There is no adjustment. The park lights are on a different circuit than the brake lights.
Do you have a third brake light that works. Its also on a different circuit but works from the same switch. Do your turn signals work. They use the same filament as the brake lights.
Also, the brake light circuit goes through the multi function (turn signal) switch.

Since the brake lights and turn signal lights use the same filament in the bulbs, the brake light circuit will pass through the turn signal switch. When a turn signal is used it cancels out the brake light for that side.

Let me know if your third brake light and turn signals work in the rear.
Also, if youy have not already, check/change the bulbs. The type of sockets those lights are in also get burned so look at them well.

Oct 18, 2011 | 1999 GMC Yukon

1 Answer

Rear brake lights wont work while the third light, signals, and tail lights work ok. Changed brake light switch and bulbs, fuses and left circuit board.


Usually when both lights fail it is due to a poor ground wire attached to the chassis of the vehicle. This is done to save wiring and would most likely explain why the other
lights still work. Hope this is useful.

Sep 25, 2011 | 1998 GMC Sierra

1 Answer

2000 GMC SIERRA Pickup---- Has been equiped to tow trailer. Brake lights in rear of truck and on cab does not work when brake pedal is depressed. They work though when you throw the lever on electric...


Disconnect the trailer wiring and recheck the vehicle lighting. If it returns to normal, then obviously the trailer is the problem. Quite often the trailer plug loses its independent ground and it will back feed thru other circuits trying to locate one. Especially if its a boat trailer, water intrusion can cause havoc on the grounds due to corrosion. The under hood electrical center has circuits intentionally meant to be used for trailers. You CANNOT just jumper into the rear lights of the truck (tail, signals and brakes coming from the tail light connector). Because it uses a multi-function switch, the brakes and signals are actually the same circuit, and have to be wired separately for a trailer plug to operate.

Mar 01, 2011 | 2000 GMC Sierra

4 Answers

1998 gmc sierra-no brake lights,bulbs ok,new brake switch,possible wiring?? Help


Try this possibilities to locate the fault. First get your voltmeter or 12v test lamp out. Check the 30 amp Brake (#2) maxi fuse in the under hood junction box.Fuse should have 12v at both sides at all times.
If okay proceed.
Go to the brake light switch. The orange wire should have 12v at all times. The white wire should have 12v when stepping on the brake.
If okay, proceed.
Next thing is the brake lamp relay in the underhood fuse box. Swap the relay with one that looks just like it and recheck the brake light operation. If the relay is no good replace it.
If the relay is swapped and still not working, see if you can feel the relay clicking when someone else steps on the brake pedal.

batt is power from the maxi fuse 12v all times
sls is the white wire from the brake switch 12v with brake applied.
gnd is body ground 0v all times
mfs goes to the multi function switch 12v with relay activated
the circuit is simple—power from the brake light switch white wires turns on the relay which then sends power back to the multifunction switch for distribution to the rear lights.
if you jump terminals batt and mfs the brake lights should come on.
If you have no power at terminal sls with the brake applied then you have a wiring fault white wire between the brake light switch and the relay
Thanks. Keep updated for any more query. You can rate this solution and show your appreciation.

Aug 17, 2010 | 1998 GMC Sierra

2 Answers

Tail lights work on both sides. turn signal and


Sounds like you need to replace the drivers brake/tail light.

Dec 14, 2009 | 1998 GMC Sierra

2 Answers

Third brake lights work but no rear brake lights


Check the switch on the brake pedal, connect the wires to each other and if the lights work then the switch is at fault, if they do not then check fuses, wiring etc.

Jun 16, 2009 | 1998 GMC Sierra

1 Answer

No brake lights, or no signal lights


brake lights and turn signals work off the same curcit, it could be the fuse or the brake light switch !!!!!!

Jun 05, 2009 | 2000 GMC Sierra

2 Answers

1998 gmc sierra brake lights


check the ground cable for the rear lights its at the back on the frame

Nov 15, 2008 | 1996 GMC Yukon

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