Question about 2000 GMC Savana

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I have a brake light issue with a 2000 GMC Savana 2500 Cargo. Brake Lights work fine... as long as the headlight switch is in the OFF Position. With headlights ON, I have no Brake Lights. Trying to determine if this is a Brake [Stop] Light Switch issue or a Headlight Switch issue. Anyone have a wiring diagram that shows connection between these 2 switches? Anyone have any thoughts? Regards,

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  • Jeff Turcotte
    Jeff Turcotte Nov 05, 2010

    I don't have the diagram, but I have an idea. If the relays run off the same circuit, the barke relay may be going out and just can't close without the extra voltage of lights off. Recommend you swap the stop light and horn relays to see if that fixes it.

  • cpeterson_bo Nov 05, 2010

    I appreciate the help. Okay--- I will check the common ground and the stop light relay. I read somewhere earlier today that the brake light switch "passed through" the headlight switch... which is why I was looking for a wiring diagram. I had a shop quote of $300.00 plus to find/fix this problem. That is just not doable for me at this time. I am happy to swap construction advice for a solution.



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I can suggest two things; it might be a faulty headlights switch and also check the stop lamp bulbs, sometimes if one of them is blown out it won't make a good ground and since the same bulb work for the stop light and the courtesy lights when the lights are on it opens the stop light circuit. Check all bulbs carefully for a fall apart filament inside the bulb.

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The only connection between the two circuits is the common ground at the taillights, check those sockets for proper ground

Posted on Nov 05, 2010

  • starrface Nov 06, 2010

    you said the brake signal goe thru the headlight switch, it goes thru the signal light switch

  • cpeterson_bo Nov 06, 2010

    Actually-- I read a reply on another site that said the brake light switch goes through the headlight switch. The Brake Lights only stop working--- when the Head Light Switch is turned on-- which lead me to believe this might be the case. I will get out my multi-meter and start tracing wires. A printed wiring diagram would be a big help. Thank you again for your comments/help.



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