3rd brake light
Team Owner
Joined: Aug 2005
Posts: 34,988
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From: Riverside County Southern California
Co-winner 2020 C4 of the Year - Modified
2018 Corvette of Year Finalist
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St. Jude Donor '09 thru '20
I replaced my third light with a LED light. Remove the plate and look at all connections. This Vettes are old and corrosion on the connectors is a possibility. Have you check on the bulb? They do go bad.
Thread Starter
Burning Brakes
Joined: Aug 2005
Posts: 862
Likes: 0
From: Lewisvlle NC
Yes, bulbs are good. Am sure it is the ground, but don't know where it connects to the chassis.
Burning Brakes
Joined: Dec 2008
Posts: 1,021
Likes: 7
From: Morgan Hill and Marina California
At least on an '87, all the lights in back share a common ground
connection. The coupe and vert are a little different, but in both
cases the '87 FSM shows all the wires coming together in the middle
of the panel at the top rear of the cargo compartment.
I'd have a buddy push the brake pedal. Use a volt meter to verify
that you are getting 12V to one side of the lamp socket, Then
release the brake pedal and use an ohmmeter to verify that you have
very low resistance between the other side of the lamp socket and
ground.
Chuck
connection. The coupe and vert are a little different, but in both
cases the '87 FSM shows all the wires coming together in the middle
of the panel at the top rear of the cargo compartment.
I'd have a buddy push the brake pedal. Use a volt meter to verify
that you are getting 12V to one side of the lamp socket, Then
release the brake pedal and use an ohmmeter to verify that you have
very low resistance between the other side of the lamp socket and
ground.
Chuck
Race Director
Joined: May 2008
Posts: 10,742
Likes: 629
From: Manheim Pennsylvania
Check the brake light switch at the brake petal. The third brake light has separate contacts than the tail lights. I had to replace my switch and that solved the problem, same no light problem as you have. You can jumper the wires at the switch to test the wiring.
