1991 Convertible 3rd Brake Light Problem
Melting Slicks
Joined: Aug 1999
Posts: 2,240
Likes: 42
From: Baltimore, MD USA
The problem is usually the Brake Light Switch.
Here's the schematic from a 90. 91 should be similiar.
12 volts from the Stop/Haz Fuse (Hot at all times) goes to terminal B of the Brake Light Switch. When you step on the brake pedal the switch closes and, 12 volts from terminal Pin B comes out of the switch on terminal Pin C.
12 volts then goes to the light bulbs for the third brake light.
Right click on the schematic and print it out which may make it easier to read.
Here's the schematic from a 90. 91 should be similiar.
12 volts from the Stop/Haz Fuse (Hot at all times) goes to terminal B of the Brake Light Switch. When you step on the brake pedal the switch closes and, 12 volts from terminal Pin B comes out of the switch on terminal Pin C.
12 volts then goes to the light bulbs for the third brake light.
Right click on the schematic and print it out which may make it easier to read.
Melting Slicks
Joined: Aug 1999
Posts: 2,240
Likes: 42
From: Baltimore, MD USA
Look at the schematic. The Brake Switch has two seperate output contacts.
Both contacts get 12 volts from the same source.
One contact is for the rear brake lights. The other contact is for the third brake light.
Like a single throw double pole switch.
Both contacts get 12 volts from the same source.
One contact is for the rear brake lights. The other contact is for the third brake light.
Like a single throw double pole switch.
Last edited by Hooked on Vettes; Jul 8, 2007 at 11:04 PM.
Thread Starter
Intermediate
Joined: Jul 2007
Posts: 34
Likes: 0
Finally had an opening and put in the brake switch. Damn, it works great. So much for the people saying its not the switch.
Thanks again. I haven't had a 3rd brake light in 10 years due to bad info.
Now I have good info and a brake light.
KW
Thanks again. I haven't had a 3rd brake light in 10 years due to bad info.
Now I have good info and a brake light.
KW
Burning Brakes
Joined: Aug 2005
Posts: 1,050
Likes: 0
From: Portsmouth VA
Congrats on the fix and welcome to The Forum!
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