Exact same issue. Third light only light that works. If you apply pressure on hazard switch all 3 lights will work. Apparent short in Hazard switch. Bought replacement switch on auction site for $60(includes cruise,turn,wiper&hazard). Will update after install if issue not resolved.
Could B the Brake light switch that is activated by the brake prdel ynder the drivers dash & also the brake lights run through the turn-signal switch which runs through the steering colume.
More than likely it is the turn signal switch in the steering column. Check by wiggling the hazard switch while pedal is depressed.
I had the same problem. It was the brake pedal switch located on the steering column. I replaced myself, switch was about if I remember correctly.
Remove the tail light cover. there' a backplane that the lights plug into and the harness plugs into. This is known to go bad. You can find it at the dealer, but it'll cost you. Go to your local discount auto parts place, look in the section that sells HELP brand parts, there you can buy both left and right backplanes for well under the cost of a factory one. Note of warning, mine was a TIGHT fit, almost too tight, but /pr vs. each, I'll make it fit.
+1 The above is very common problem.
Here is what you are looking for: http://www.theautopartsshop.com/Search/Default.aspx?Pat=1999++Tahoe+Tail-Light&Key=Year+Auto+Car-USA+Parts&gcode=ChevroletTahoe1999LKQGM28071012864&gpartnum=99CheTahoe%2FLKQGM2807101
It is likely the brake switch on the steering column as others have indicated. Had same problem on 94 Sierra. Can be replaced or maybe cleaned to get contact.
My 3rd brake light would still work, but hazards or brake lights would not. When I played with the hazard light switch they would work and the brake lights would work. Purchased new hazard/Blinker/wiper switch on eBay for 1/4 the price of dealership (Around ). About 3 hours to slowly take steering column and dash apart to replace.
Foot pedal switch is good it is working 3rd brake light that is not going through turn signal switch.Hazard light switch in turn signal switch gets hot and distorts losing contact causing brake light and turn signal issues
The brake lights are a separate circuit from the other lights. Check the fuses and bulbs. If fuses and bulbs are okay I would suspect the brake light switch is at fault.
I tried all the fuses, the parts that under the brakes I checked that. All lights come on and working except the brake lights no break lights.
There are individuak fuses for each headlight
Have you checked the fuses? Different circuits have different fuses. It may be your wiring harness, but check the fuses first.
If your brakes lights are not working and all of your other lights are OK try replacing your "brake stop switch". You may have to have either your local auto shop or local dealer replace the switch because it's hard to do yourself. I had the same problem on my Tahoe and replacing the brake stop switch solved it right away.
I just had my Daewoo Leganza brake light switch replaced. It goes under the brake pedal. and now my brake lights work fine.
Check bulbs they are double filamented smaller for brake lights larger for tailights Check fuses Check stop light switch
I'm thinkin' the headlight switch is at fault.
check that you have double filament bulbs in tail lights
I had this same problem. If the bulbs and the fuses are good its most likely the brake switch. Its a plunger like switch on the brake pedal. Its usually the only thing on the brake pedal. Its pretty easy and cheap to change. I would start there.
Fuse for the "Third" Brake LightAlthough I have no experience with the Chevy Tahoe, the systems are similar for almost all vehicles.The third brake light is tied into the wiring for the other brake lights and is protected by the SAME fuse they are.Thus, there is no separate fuse for the third brake light.Therefore, IF your other brake lights are working, then a failure of the third brake light to activate IS NOT caused by a fuse, but instead an "open circuit" condition in the "dedicated" third brakelight wiring [from where its wire "splits" off of the wiring harness to the other brake lights].This is usually caused by a connector which has become disconnected, or a cut or broken wire.
Possible bad switch on the brake pedal? When you push on the brake pedal, it activates a switch, that switch turns on your brake lights. If the bulbs and fuses are ok, check the switch with an ohmeter.
you probably need to lift up on the brake pedal a couple of times to reset the brake switch. worked on our 86
Check all the fuses and replace all of the blown fuses. If you still have no brake lights check your brake light switch. The brake light circuit also runs through a red cylindrical shaped relay called the "failure sensor" which lights and indicator bulb in the intrument cluster if a brake light bulb or some other bulb has failed. Internal failure in this part will often have the symptom "No brake lights".
check the fuses..sounds like you have a blown fuse for the brak lights. look in the fuse box it's located there.
replace brake light switch on brake pedal if it hasn't been done try that
You need a new multi-function switch (blinker switch) . The current for the brakes goes through it
Likely to be the brake light switch on the pedal at fault if the bulbs and fuses are good and other lights work ok.
I have same year Tahoe and same problem. Check fuses first to make sure it isn't a fuse. The third brake light assembly can be removed by opening the back door and unscrewing the screws. Then unplug the connector. A new unit is about $175.00 and the whole unit must be replacee as it is LED light not bulbs.
its the blinker control arm.if you move it back and forth you should see the two other brake lights go on as the brake is pressed.
1995 Chevrolet Monte Carlo no tail lights or dash lights they will come on at time and go off the fuses are not bowed. The tun singles and flasher and brake light work. What should I look for now?
use an ohmmeter it will show the ground or a test light if it lights up it willl be the other wire
Blown fuse or bad brake light switch?
start by checking fuses,then at brakelight switch check for power on one wire,should have power.next check power on the other wire with brake pedal pushed down.if you have power check wires from switch to lights if third brake light works fuse and switch ok.
change the brake lights check the fuse check the brake light swtch