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Thread: Parasitic battery drain/help me play Perry Mason.....

  1. #21
    I post a lot... Toploader's Avatar
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    But Tom, if I leave the neg cable off for about a week and then put it back on.....the car cranks and starts right up! Which seems to suggest that the battery itself is not at fault, and goes dead only when the neg cable is re-attached to permit the battery to go dead due to this mysterious parasitic drain.

  2. #22

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    Quote Originally Posted by Toploader View Post
    But one has to assume that 0.000.7 amp drain is a nonissue.
    I had a near zero drain too. I could let it sit out 8 hours during the day and it would start right up. I could let it sit for 4 hours overnight and it would be completely dead. And I couldnít trace the draw to anything. My guess is that the difference in temperature contributed somehow. Pretty much what Iím saying is donít rule out the alternator, especially if everything else checks out.


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  3. #23
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    Yes!...I was also told that the rear defog switch often goes bad due to temp change!..........go figure???

  4. #24
    I post a lot... Toploader's Avatar
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    So it was actually nice today in NYC Removed the rear defog switch from the dash, re-attached the neg battery cable and now will wait and see if the battery again goes dead. If it remains fully charged, then I will know its the de-fog rear grid switch. If it goes dead, then I will remove the wires to the alt for a week and come back and see if will start.

  5. #25
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    Btw, the switch I removed had the following F0MoCo number:EOVB-19A328-A2B

    The new one I have ready to go in is: EOAZ-18C621B

    I have no idea why Ford changed numbers??

  6. #26
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    Try the underhood light. It would switch on when the hood was closed and turn off when I opened it. The whole time I had assumed the bulb was dead.

    1989 Lincoln Town Car 249k miles, current project car
    2018 Toyota Tacoma bone stock, daily driver

  7. #27
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    Quote Originally Posted by L1011tristar17 View Post
    Try the underhood light. It would switch on when the hood was closed and turn off when I opened it. The whole time I had assumed the bulb was dead.
    I took that bulb out over ten years ago with the trunk bulb.

  8. #28
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    So far so good....with battery hooked up and rear defog taken out, battery remains fully charged. Have new switch ready to go in, will just wait a few more days for giggles;-)

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