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Suburban underhood light drains battery

Discussion in 'Truck & Equipment Repair' started by dobgolf, Apr 19, 2007.

  1. dobgolf

    dobgolf Junior Member
    Messages: 2

    I have a 1999 Sub and the underhood light does not always turn off which drains the battery. How do I resolve the issue ? Is it most likely the horn relay which controls the underhood lamps. I also have an intermittent issue with the daytime running lights but the dash indicator works as it should i.e. it is on.
  2. Vaughn Schultz

    Vaughn Schultz PlowSite.com Addict
    Messages: 1,565

    Take out the light bulb, put it in your glove box and if you should need it pop it in. That would sure be simple, maybe not correct.
  3. dobgolf

    dobgolf Junior Member
    Messages: 2

    Thanks I have already unplugged it - just wondering if there is a way to fix it and if the day time running lights issue is related.
  4. wild bill

    wild bill PlowSite.com Addict
    Messages: 1,239

    light out

    it is a mecury vapor switch just replace it!it works when you lift the hood past a point then it complets the circuit:salute:
  5. Nascar24

    Nascar24 Senior Member
    Messages: 645


    The DTRL may be going off if your Emergency brake is ratched down a couple of teeth, ran into this with my Suburban a few years back. I also had a battery drain, so I thought, I found that one of the side terminals were over tightened and put a crack in the case where the electrolyte was seeping out and weaking the batteries output and re-charging ability.
  6. kerpal

    kerpal Junior Member
    Messages: 3

    That's good to hear.. How is it today??