rear fog lights = battery dead?

Discussion in 'General Motoring' started by colmhogan, Dec 9, 2008.

  1. colmhogan

    colmhogan Guest

    so our volvo S70 had a dead rear light.
    to compensate for it for safety and legal reasons, until we had time
    to replace it, we used our rear fog lights. car was just used 4-5
    2 weeks later, can't start the engine, the mechanic claims it was the
    rear fog light draining the battery.
    anytime we turned off the engine, the rear fog light turned off when
    ignition was off, although the switch was probably left on.
    is it still possible to drain the battery even though the light is not
    actually on?
    colmhogan, Dec 9, 2008
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  2. colmhogan

    James Sweet Guest

    Your mechanic is full of it, if the rear fog lamp drained the battery, then
    something is wrong with the electrical system. If the fog lamp was not on
    with the car off, your problem is unrelated.

    Personally I would look for a more competent mechanic.
    James Sweet, Dec 9, 2008
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  3. colmhogan

    Glenn K Guest

    No !! it is time to find a new mechanic who knows what he or her is doing
    Glenn K
    Volvo Certified Technician
    ASE Certified Technician
    Glenn K, Dec 9, 2008
  4. colmhogan

    ransley Guest

    I used my fog bulb to do the same and no issues, the only way it could
    drain power is a short on the circuit, so ask him how he detected the
    short and how bad it is, or the sign says heesamoron.
    ransley, Dec 10, 2008
  5. colmhogan

    colmhogan Guest

    Thanks everyone for your feedback,looks like it's time to find a new
    mechanic ;)
    colmhogan, Dec 11, 2008
  6. colmhogan

    z Guest

    snort, the guy at the local firestone told me the battery he sold me
    died within 11 months because i had a cb radio plugged in to the
    cigarette lighter. (which was off when the key was off, in case
    there's any doubt) After i got the new battery on warranty i didn't go
    back there again, obviously.
    z, Dec 11, 2008
  7. colmhogan

    z Guest

    i'm ceertain it's not the case here, but, technically, in a stupidly
    designed vehicle, that is possible; if the fog light switch were
    connected to a relay which is always hot but the lights themselves are
    connected via the ignition switch (and the relay).

    for example: i got the idea for this possibility from the local
    newspaper car advice column; somebody's pickup truck (detroit, don't
    remember the make) had intermittent battery dying overnight; turned
    out to be that he had bought the snowplow package, but not sprung for
    the auxiliary lights that were optional with the package. well, even
    if you didn't buy the lights, the package's standard wiring harness
    came with the relay which was connected to the dash switch which was
    always hot; so if the switch was on and the ignition was off, the
    battery was draining through the relay and you had no way to know it.
    z, Dec 11, 2008
  8. colmhogan

    Roadie Guest

    Your mechanic may have thought the fog lights were a home-wiring job
    that are on all the time. You need another mechanic. I would have
    the battery and connections checked. Next concentrate on the charging
    Roadie, Dec 15, 2008
  9. colmhogan

    z Guest

    i copy NASCAR and just paint the headlights on the front of the car.
    no chance of them burning out the battery that way.
    z, Dec 16, 2008
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