Tow/Haul Switch

Discussion in 'GM Powertrain' started by cberentsen, May 18, 2009.

  1. cberentsen

    cberentsen New Member

    Tow/Haul switch inoperative.

    99 GMC Sierra 1500 4x4.

    Owners manual doesn't tell which of the three fuse blocks contain the fuse, perhaps combined with another wiring circuit? Neither does the Chilton's even address the Tow/Haul switch.
  2. Springthing

    Springthing Epic Member 5+ Years 1000 Posts

    I'm not even sure what switch you are talking about so I won't be of much help! But if all else fails grab yourself a meter and go from one fuse to the other checking for continuity on all the fuses.
  3. cberentsen

    cberentsen New Member

    Thanks Steve!
  4. cberentsen

    cberentsen New Member

    It's the button at the end of the shift lever that locks out overdrive when towing.
  5. Springthing

    Springthing Epic Member 5+ Years 1000 Posts

    ah! I know what you mean.. I don't have it so wasn't sure if yours did. :) Well, hopefully someone will come along and be able to give advice. I'd say if you have a meter just start going to town on checking for continuity. Should take you more than 5 minutes or so.
  6. trimhalifax

    trimhalifax Rockstar 100 Posts

    You might want to check for broken wiring. Pop off the cover under your steering column and check the two wires near the shift lever. These have a habit of breaking due to movement of the lever.
  7. pmf608

    pmf608 Epic Member 5+ Years 1000 Posts

    I agree on this one. They are two very small thin wire wrapped in a larger casing. I had to cut them to replace my shifter boot, and there is NO extra slack on them. i could see them breaking. I had to extend them to keep them from shorting when I shifted out of park once I fixed them. I would check this and if one or both wires are broken, I would solder in some extensions, seal them up, and you should be good to go.
  8. cberentsen

    cberentsen New Member

    Thanks to all of you!
  9. woodbw

    woodbw New Member

    cberentsen did you find a problem with your wiring. My 06 just up an quit working over the winter. Only use it when camper is loaded and the switch did nothing.
    QUestion for you is, when you switch on ignition does the light come on during the light test? My light does not so was thinking burnt out bulb, will road test to see if shift points are diff\rent soon.

  10. trimhalifax

    trimhalifax Rockstar 100 Posts

    Mine only lights up when switch engaged,not at initial startup.

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