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  1. #1

    Default electrical problems need help

    I just bought 89 1500 truck and idont have any taillights or turn sigs need help ? also put a new brake light switch on it but it wants to move with the pedal so my brake lights stay on. is there something that is suposed to keep it from moving? thanks any help

  2. #2


    So far as the lights not working, check the bulbs first. Be sure they are the correct bulbs.

    Then in your owner's manual will be fuse information. Check the associated fuses.
    How to check fuses...

    Then if those not the problem, check the electrical connector for the tail lights under the rear center of the rear bumper area. Sometimes there can be a bad connection there or add-on trailer wiring can be a problem. If you are getting power there, check your tail light printed circuit boards.

    If the problem is prior to the rear bumper connector, you would probably need a GM Factory Service Manual set which you can order from or a GM dealer. This would have complete wiring diagrams and troubleshooting instructions.
    92 GMC Sierra 2500

  3. #3


    Do the front marker lights and turn signals work? If they do, that makes it quite a bit easier. As suggested, check the connector at the back bumper. You can use a test light to see if the wiring is good up to that point.
    When you hear hoofbeats, look for horses not zebras.

  4. #4


    the front lights work if the hazard lights are on.could the switch be bad? what holds the brake light switch in place it moves with the pedal so the brake lights stay on?

  5. #5


    So far as the switches being bad, anything can be the source of the problem, you need to test with a multimeter to find the problem.

    As to the brake switch, I've never replaced one on your style vehicle, so I'm no help!

    The factory manual probably would not be much help either. Many times with things like this they will just say "Replace the brake switch"! And that is it!

    This is a discussion of replacing a brake switch. I don't know if it is like yours or not...

    Then also you may be able to go to a wrecking yard. There may be a vehicle similar to yours there with the steering column pulled out. Then you might be able to see better how the brake switch is attached.

    Also might try looking at it with a flashlight and mirror. Or do that at the wrecking yard. See how other switches are attached.

    It also might help if you can get some sort of cot or strong boxes the height of the truck floor and place them next to the driver's door and lay on these so you can be more comfortable laying on your back looking up at the brake switch.

  6. #6


    well i think i found one problem I put a test light in the sockets and got juice.but Ithink its the strat of many. thanks Bill I think that site is what I needed . Going to chevy dealer monday for diagrams would it be ok to post them ? may help some one else someday.I also found some ground wires unhooked? I am thinking I bought someones headacke but I will get it fixed one day,thats what i like fixing things lol.

  7. #7


    Here's a diagram.
    Attached Thumbnails Attached Thumbnails 89 chev.jpg  

    2004 SILVERADO 2500HD LS
    Pro Comp Leveling Kit
    285-75-16 Cooper ST All Terrains
    Pro Comp Programmer
    Bilstein Shocks
    Linux Bed Liner
    Tinted Windows

    Other rides:

    1967 Landcruiser <350 Chevy>
    1970 Camaro
    1990 Geo Metro Convertible
    2007 FJ Cruiser

  8. #8


    Quote Originally Posted by Jimmiee View Post
    Here's a diagram.
    If you want a PDF so you can see it better send me your address and I'll send it to you.

  9. #9


    Quote Originally Posted by silver89aldo View Post
    Going to chevy dealer monday for diagrams would it be ok to post them ? may help some one else someday.

    Well it says Copyright General Motors on my GM manuals, so that is why I don't post copies. Also some troubleshooting sections can be 80 pages long like the fuel system section for my 92. I'm certainly not going to copy all that! But I will tell people where they can get the information.

    It doesn't matter to me what anyone else does.

    BTW older Factory Service Manual sets will have maybe 3 or 4 books to the complete set. My 82 has general service manual, electrical diagrams, fuel and emissions (all the engine, fuel, and engine electrical/computer stuff), and a unit repair manual.

    And I have a newer 99 set which totals 6000 pages over 4 books.

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