Question about 1999 GMC Yukon

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Brake lights dont work untill i turn the lights on, then stay on

When I apply the brake pedal the 3rd brake light comes on, but no tail lights. When I turn the lights on, the tail lights turn on but the brake lights also stay on. Turn signals were working then stopped. All fuses and bulbs are good.

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  • 85chevy305 Feb 09, 2009

    Thanks for your promt reply, I checked out your thoery and no dice. I took the tail light apart and they are both the same bulb and can only go in one way. Even if you were to turn the bulb the opposite way the contact spots still fall into the same place. I did try the high beams and they only work if the light switch is in the on position. Signals do not work, but when i turn the lights on the parking lamps in the front turn on. Still the same problem with both bulbs on in the tail lights though.

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Hi, are the tail lights and the brake lights in the same light unit?
If so, there is a possibility the bulbs are in the wrong way. If it is a stop/tail bulb then there are two locating pegs on the side of the metal part. If you look, one is higher than the other which has to locate into the correct slot in the holder.

Another possibility is the bulb is wrong, there are double and single contacts. Check the contact on the base of the bulb is the same as the contacts in the holder.

TL

Posted on Feb 09, 2009

  • Craig Davies
    Craig Davies Feb 09, 2009

    just be aware although the terminals line up, there is still only one way it can go in. Those terminals are not negative and posative, the bulb earths through the metal bulb base.



    One is a 5 watt tail light, and the other is a 21 watt brake light.



    Whatever one is going onto brakelight when side is switched on, try removing the bulb and turning it 180 degrees and try it.



    TL

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