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66vetteman

Brake lights don't work when headlights are on!

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2000 Chevy Express Van 1500, 5.7L. Brake lights work fine until the headlights are turned on. When the headlights are turned on and the brake applied, the bottom running lights (same bulb as brake lights, different filament) go out and the brake lights do not come on. Third brake light works ok regardless. Any thoughts?

Thanks!

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With park or headlights ON: both bulbs light the dimmer filament. When brake is pushed the bulb with the new socket lights the bright filament and the dim filament, the other light goes out.

 

With park or headlight OFF and brake pushed: The bulb with new socket lights the bright filament, the other one lights the dim filament.

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With park or headlights ON: both bulbs light the dimmer filament. When brake is pushed the bulb with the new socket lights the bright filament and the dim filament, the other light goes out.

 

With park or headlight OFF and brake pushed: The bulb with new socket lights the bright filament, the other one lights the dim filament.

 

 

I think you have found the bad socket then. Has this truck had any modifications to the wiring that you know of? Like maybe someone installed the U-Haul trailer light kit?

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No trailer light kit. It is a van conversion so it has lots of interior lighting, rear stereo & spkrs, TV, elec couch/bed etc. This was all professionally done well before I bought it. The brake light problem is recent as there is a yearly safety inspection where it was discovered. Not found last year.

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As a follow up, I changed the other rear socket and the problem is gone! Thanks to Doug and oldscsc for all the help.

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As a follow up, I changed the other rear socket and the problem is gone! Thanks to Doug and oldscsc for all the help.

 

what do you guys mean when you say rear socket ?

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As a follow up, I changed the other rear socket and the problem is gone! Thanks to Doug and oldscsc for all the help.

 

what do you guys mean when you say rear socket ?

 

 

The light socket that holds the bulb. Duh! :D

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As a follow up, I changed the other rear socket and the problem is gone! Thanks to Doug and oldscsc for all the help.

This same issue is happening to my 1994 Chevy truck. I replaced the circuit board for both sides, and still doing the same. You said you replaced the rear socket. Can you upload a picture of how it should look?

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This same issue is happening to my 1994 Chevy truck. I replaced the circuit board for both sides, and still doing the same. You said you replaced the rear socket. Can you upload a picture of how it should look?

please refer to post #23 for your answer

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Identical symptoms on my 2000 Chevy Express 2500 van, although only on one side. Upon inspection, the back up lamp and socket were very corroded, and although the lamp was still functional, I decided to replace the tail light harness and lamp for less than $30 at the local auto parts store. This solved the brake light problem as well. I thoroughly appreciate the generous expert contributions on this thread which helped me save a trip to the mechanic.

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