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No brake lights

Tiny
MASTERTECHTIM
  • MECHANIC
  • 4,749 POSTS
Check the white wire going from the brake light switch to the directional switch. If it has power when brakes are applied then the turn signal swit ch is bad. If no power to white wire you need to check for power at the orange wire at the brake light switch. I have been seeing alot of turn signal switches cause no brake lights on this truck. The brake light circuit goes through the turn signal switch then to brake lights
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Thursday, March 21st, 2019 AT 6:59 PM (Merged)
Tiny
MIKELWC
  • MEMBER
  • 7 POSTS
There is no steady voltage on the orange or white wires. The voltage is jumping around in the mv range.
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Thursday, March 21st, 2019 AT 6:59 PM (Merged)
Tiny
SATURNTECH9
  • MECHANIC
  • 30,869 POSTS
Now go to the underhood fuse by the battery and see if the stop lps fuse has battery voltage on both sides of it?
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Thursday, March 21st, 2019 AT 6:59 PM (Merged)
Tiny
DALE DAVENPORT
  • MEMBER
  • 2 POSTS
  • 1995 CHEVROLET SUBURBAN
Electrical problem
1995 Chevy Suburban V8 Automatic

I have no brake lights. I replaced the multi-function switch and the brake light switch. All fuses are good in the truck. What is the problem?
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Thursday, March 21st, 2019 AT 6:59 PM (Merged)
Tiny
JDL
  • MECHANIC
  • 16,098 POSTS
Hello, does the high-mount brake lite work? Did you check the wiring circuit to the brake switch? Orange wire is hot going to the brake switch. When the switch is activated, the white wire goes hot. The highmount brake lite isn't wired through the turn switch, but, the lower brake lites are. Anytime you check a fuse, you also have to check for voltage at the fuse.
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Thursday, March 21st, 2019 AT 6:59 PM (Merged)
Tiny
MIKELWC
  • MEMBER
  • 7 POSTS
Stop lps fuse had battery voltage on only one side. Checked fuse and it was blown! Replaced fuse and now have brake lights but no third brake light or readout on the trailer brake controller.
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Thursday, March 21st, 2019 AT 6:59 PM (Merged)
Tiny
DALE DAVENPORT
  • MEMBER
  • 2 POSTS
High mount lite does not work either
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Thursday, March 21st, 2019 AT 6:59 PM (Merged)
Tiny
SATURNTECH9
  • MECHANIC
  • 30,869 POSTS
Alright stepping on the brakes does the chmsl fuse in the underhood fuse box have power to both sides of it?
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Thursday, March 21st, 2019 AT 6:59 PM (Merged)
Tiny
JDL
  • MECHANIC
  • 16,098 POSTS
I'd check for voltage at the brake switch.
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Thursday, March 21st, 2019 AT 6:59 PM (Merged)
Tiny
MIKELWC
  • MEMBER
  • 7 POSTS
Chmsl fuse was also blown! Replaced it and now have ALL of my lights!

Thank you!
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Thursday, March 21st, 2019 AT 6:59 PM (Merged)
Tiny
SATURNTECH9
  • MECHANIC
  • 30,869 POSTS
Make sure your trailer wiring matches your truck that could be blowing the fuses.
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Thursday, March 21st, 2019 AT 6:59 PM (Merged)
Tiny
RABROWN000
  • MEMBER
  • 3 POSTS
  • 1994 CHEVROLET SUBURBAN
  • V8
  • 4WD
  • AUTOMATIC
  • 194,000 MILES
The bulbs are fine, the fuse is good, I replaced the brake light switch but still no brake lights. Suggestions?
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Thursday, March 21st, 2019 AT 6:59 PM (Merged)
Tiny
WRENCHTECH
  • MECHANIC
  • 20,761 POSTS
Does your 3rd (high mount) brake light work?
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Thursday, March 21st, 2019 AT 6:59 PM (Merged)
Tiny
SATURNTECH9
  • MECHANIC
  • 30,869 POSTS
Also glad I could help you.
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Thursday, March 21st, 2019 AT 6:59 PM (Merged)
Tiny
RABROWN000
  • MEMBER
  • 3 POSTS
No, it's does not come on either.
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Thursday, March 21st, 2019 AT 6:59 PM (Merged)
Tiny
MIKELWC
  • MEMBER
  • 7 POSTS
I have been towing this trailer for several years with no problem, until now.

I will check and see if something may have shorted a wire.

Thanks again and have a great day! Mikel
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Thursday, March 21st, 2019 AT 6:59 PM (Merged)
Tiny
RABROWN000
  • MEMBER
  • 3 POSTS
The light on the trailer brake unit doesn't come as well.
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Thursday, March 21st, 2019 AT 6:59 PM (Merged)
Tiny
SATURNTECH9
  • MECHANIC
  • 30,869 POSTS
Your welcome glad I could help.
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Thursday, March 21st, 2019 AT 6:59 PM (Merged)
Tiny
WAYNECLEVEROBERTS
  • MEMBER
  • 1 POST
  • 2002 CHEVROLET SUBURBAN
  • 5.4L
  • V8
  • 2WD
  • AUTOMATIC
  • 155,000 MILES
I just had the rear main seal replaced and it returned with the brake lights not working. The shop says it's nothing they did? I first checked the bulbs. They are good. But there is no power to them. Izin check the fuses and they are good. I've been replaced the brake pedal switch. And still no brake lights checked and I have going to the brake pedal switch and from the brake pedal switch when it is depressed. I see no breaks in the wire and I'm not sure where to go from here?I wonder if the shop in replacing that their main seal, where they have to remove the transmission, if a smashed a plug nothing in the process? But it appears to me that the brake wires don't run through the middle of the car where they were working it looks like they run up the side car under the passenger seat.
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Thursday, March 21st, 2019 AT 6:59 PM (Merged)
Tiny
JOHNNYT73
  • MECHANIC
  • 924 POSTS
Are you sure you checked all fuses under the hood and inside the vehicle? Do you have any type of towing connector plugged in by the hitch?
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Thursday, March 21st, 2019 AT 6:59 PM (Merged)

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