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Brake lights and turn signals do not work?

Tiny
MONTANA406
  • MEMBER
  • 1996 CHEVROLET BLAZER
  • 4.3L
  • V6
  • 4WD
  • 229,451 MILES
Turn signals brake lights and hazards do not work at all neither does the turn indicator on the dash. I have a parts Blazer with 50,000 miles so I have replaced the turn signal/multi switch, the thermal flasher. Also, replaced all my fuses just to be on the safe side, and I have checked the wiring for corrosion and bare spots. I have also replaced all the bulbs and still nothing works. The only other thing I can think of that it might be is my headlight on/off switch.
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Thursday, March 2nd, 2017 AT 3:54 PM

8 Replies

Tiny
CARADIODOC
  • MECHANIC
  • 33,871 POSTS
Lets start with the brake lights. When we solve that, the signals will likely work too.

Check for voltage on the orange wire on the brake light switch. You should find twelve volts all the time. If it is missing, check on both sides of the stop/hazard fuse one in the inside fuse box. The fuses have two test points on top. That is a yellow twenty amp fuse.

If you do have twelve volts on the orange wire, check if that twelve volts appears on the white wire when the brake pedal is pressed.
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Thursday, March 2nd, 2017 AT 4:21 PM
Tiny
MONTANA406
  • MEMBER
  • 4 POSTS
Okay so I found a wire spliced into the white wire to the brake switch I removed that and the brake lights now work but the top center one does not and still nothing on the blinkers
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Thursday, March 2nd, 2017 AT 5:08 PM
Tiny
MONTANA406
  • MEMBER
  • 4 POSTS
When my brakes are on and I hit the blinker it shuts off whatever side the blinker should be on so if I put on the left blinker and keep switching it on and off it acts like the blinker should but that is doing it manually
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Thursday, March 2nd, 2017 AT 5:14 PM
Tiny
CARADIODOC
  • MECHANIC
  • 33,871 POSTS
You removed a wire and now the two brake lights work?

The center high-mount brake light is not involved in any way with the signal switch. It comes right off that white wire. Do you get twelve volts on that white wire at the brake light switch when the pedal is pressed? If you do, check at the center brake light assembly to see if you have twelve volts there on the white wire.
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Thursday, March 2nd, 2017 AT 7:21 PM
Tiny
MONTANA406
  • MEMBER
  • 4 POSTS
The wire that was tied to the white wire was grounding out. Everything works except the blinkers and the center brake light.
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Thursday, March 2nd, 2017 AT 7:43 PM
Tiny
CARADIODOC
  • MECHANIC
  • 33,871 POSTS
A grounded wire should have caused the fuse to blow when the brake pedal was pressed. Anyhow, check that high-mount light for voltage. Will be back tomorrow to see how you are doing.

I have to look at the diagram again, but I have a feeling you are missing a twelve volt supply to the signal switch.
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Thursday, March 2nd, 2017 AT 8:01 PM
Tiny
LISA A SAUNDERS
  • MEMBER
  • 1 POST
  • 1995 CHEVROLET BLAZER
  • 140,000 MILES
Yes, my brake lights, blinker lights, and hazard lights have stopped working. I had a trailer hooked up to it early in the day and worked fine. Later they stopped working unplugged trailer checked fuses. I still have running lights but not brake hazard and blinkers.
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Wednesday, July 28th, 2021 AT 1:41 PM (Merged)
Tiny
HMAC300
  • MECHANIC
  • 48,601 POSTS
Check fuse 1 and 16 in dash box one is for t/s other for hazard/brakes. Then check to see if powr is going through multi function switch. You can check white wire going in and yellow and dark/grn going out if nothing going out switch is bad. White wire is brakes so brakes will need to be applied. If power goes out then it's a short, bad ground. Ground wire for rear lights is on LH rear of frame.
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Wednesday, July 28th, 2021 AT 1:41 PM (Merged)

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