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Thread: No Tail Lights

  1. #1

    Default No Tail Lights

    I have a 1994 GMC suburban. The tail lights recently quit working. The front parking lights work, and the brake lights work and the instument panel lights work. I put new bulbs in and checked the fuse. I checked the circut board in the tail light itself and they seem ok. I also tried replacing the headlight switch. I later discovered that the trailer marker lights do not work. Are there any other weak points to check? Are the tail lights and the front parking lights on the same circut? Also I have heard that there is a fuse box under the hood as well as the one under the dash. Is this true? If so where is it, as I have not been able to find it.

    Thank you for any help you can give me.

    Ben

  2. #2

    Default

    I have seen the headlight switch go bad and cause the tail lights to not work. You might want to grab a test light and check the switch out.

    1995 Silverado 4x4
    6" BDS Suspension Lift-3" Body Lift-Add A Leaf in rear -Trailmaster SSV Shocks-Duel Steering Stabilizer Kit -AirAid Cold air intake-
    4.56 Gears with Detroit Auburn Locker-Pro-Comp Traction Bars with duel shocks-Aluminum Skid Plate Kit-38.5" x 16.5" Mickey Thompson Baja Claws-Constant Dropping fuel gauge

    2005 Yukon XL Jet Power Programmer, Bilstein Shocks, Bilstein rear springs, Helwig Anti-sway bars, EGR Window Visors, EGR Hood Shield, Denali Headlights, Headlight harness upgrade, GE NightHawk Bulbs, White Night Rear lighting system, Russell Braided SS brake lines, PowerStop Brake pads, PowerStop cross drilled and Slotted Rotors, http://www.gmtruckclub.com/forum/sho...5-GMC-Yukon-XL
    2002 Silverado ext cab 2wd (Sold)
    2003 Yukon XL (Totaled)

  3. #3

    Default

    Checked that already.

  4. #4

    Default

    Ben, the front marker lights and the rear marker lights are part of the same circuit, but they might not share anything except the common switch and 12 volts from the battery. Usually, the front and rear are separately fused (just so a short doesn't put all lights out). You may have a blown fuse (it's probably in the fuse panel under the hood), but why did it blow? If you find a blown fuse, it may blow when replaced. If it does, check the wiring under the truck, going to the rear, there may be a bare spot.
    Ray

    '09 Avalanche LTZ - Black
    '05 Envoy XL (sold)

  5. #5

    Default

    So there is a box under the hood then? I have not been able to find it. Where is it located? That is what I have been thinking too, about the wiring going to the rear and the question of why would it blow. Only problem is I am not finding a blown fuse and I do not see any visible problems, although I have not checked real thoroughly in the area where the wiring goes up to the hood.

    On my 1995 I blew the fuse for the tal/marker/dash lights when I hooked up a trailer with bad wiring. With that one everything was all one fuse, but I think that the wiring may be different between the 94 an the 95. The fuse box is in between the door and the dash instead of under the dash next to the stearing column, anyway

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