1994 Silverado Brake Lights

94silver · 12-23-2008, 01:58 PM

The rear brake lights on my 1994 Silverado 1500 truck have quit working. The over cab brake light works correctly. Here is what I've done so far.

1. Replaced the circuit boards in the rear lights.
2. Replaced the switch on the brake pedal.
3. Replaced the relay under the hood on the firewall near the brake master cylinder.

The turn signals work and since this truck uses the same bulb and filament for the brake lights and turn signals, I know the wiring is ok. I have tested the system with the trailer wiring connector in place and removed with no difference in results. What do I do next?

leolkfrm · 12-23-2008, 02:11 PM

welcome to the forum
How far have you traced power or the lack off?

94silver · 12-23-2008, 03:35 PM

I have power to the rear lights when the turn signals are working and they use the same wires and light filaments as the brake lights. How should I trace the power on the brakes?

gmctrucks · 12-23-2008, 04:03 PM

Well I know that the electronic circuit boards are always going out on them but first check your bulbs and all the connects on the board with a test light before your replace the boards.
Good luck! GMC
PS-Welcome to the forum and howdy from TEXAS I hope your stick around you can meet a lot of good folks here like me. He! He! GMC

leolkfrm · 12-23-2008, 07:04 PM

ok power to the tailight wire and to the stop/directional wire?

John 424 · 12-23-2008, 08:03 PM

yea my 97 doing the same thing i thinks it just a fuse and my gages dont light up and brake lights don't turn on but if i press the brakes they work

94silver · 12-24-2008, 06:44 AM

I have replaced the circuit boards, and the turn signal wire and the brake light wire is the same wire. I have power to it when I use the turn signals but not when I put on the brakes.

gmctrucks · 12-24-2008, 07:23 AM

How about checking to see if you have power from you brake switch under the dash or maybe it needs adjusting.

94silver · 12-24-2008, 07:43 AM

I have power at the brake light switch on the pedal. The brake light over the cab works.

leolkfrm · 12-24-2008, 08:27 AM

do you have power on both sides of the brake light switch when you push on the pedal

12-23-2008, 01:58 PM	#1
94silver Junior Member Join Date: Dec 2008 Posts: 8	1994 Silverado Brake Lights The rear brake lights on my 1994 Silverado 1500 truck have quit working. The over cab brake light works correctly. Here is what I've done so far. 1. Replaced the circuit boards in the rear lights. 2. Replaced the switch on the brake pedal. 3. Replaced the relay under the hood on the firewall near the brake master cylinder. The turn signals work and since this truck uses the same bulb and filament for the brake lights and turn signals, I know the wiring is ok. I have tested the system with the trailer wiring connector in place and removed with no difference in results. What do I do next?

12-23-2008, 02:11 PM	#2
leolkfrm Senior Member Join Date: Mar 2008 Location: N.Y. Posts: 4,877	welcome to the forum How far have you traced power or the lack off? __________________ 4 wheels move the body 2 wheels move the soul B.W.A.I

12-23-2008, 07:04 PM	#5
leolkfrm Senior Member Join Date: Mar 2008 Location: N.Y. Posts: 4,877	ok power to the tailight wire and to the stop/directional wire? __________________ 4 wheels move the body 2 wheels move the soul B.W.A.I

12-24-2008, 08:27 AM	#10
leolkfrm Senior Member Join Date: Mar 2008 Location: N.Y. Posts: 4,877	do you have power on both sides of the brake light switch when you push on the pedal __________________ 4 wheels move the body 2 wheels move the soul B.W.A.I

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12-23-2008, 03:35 PM	#3
94silver Junior Member Join Date: Dec 2008 Posts: 8	I have power to the rear lights when the turn signals are working and they use the same wires and light filaments as the brake lights. How should I trace the power on the brakes?

12-23-2008, 04:03 PM	#4
gmctrucks Senior Member Join Date: Nov 2006 Location: Houston,Texas Posts: 4,635	Well I know that the electronic circuit boards are always going out on them but first check your bulbs and all the connects on the board with a test light before your replace the boards. Good luck! GMC PS-Welcome to the forum and howdy from TEXAS I hope your stick around you can meet a lot of good folks here like me. He! He! GMC

12-23-2008, 08:03 PM	#6
John 424 Junior Member Join Date: Dec 2008 Posts: 1	yea my 97 doing the same thing i thinks it just a fuse and my gages dont light up and brake lights don't turn on but if i press the brakes they work

12-24-2008, 06:44 AM	#7
94silver Junior Member Join Date: Dec 2008 Posts: 8	I have replaced the circuit boards, and the turn signal wire and the brake light wire is the same wire. I have power to it when I use the turn signals but not when I put on the brakes.

12-24-2008, 07:23 AM	#8
gmctrucks Senior Member Join Date: Nov 2006 Location: Houston,Texas Posts: 4,635	How about checking to see if you have power from you brake switch under the dash or maybe it needs adjusting.

12-24-2008, 07:43 AM	#9
94silver Junior Member Join Date: Dec 2008 Posts: 8	I have power at the brake light switch on the pedal. The brake light over the cab works.

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