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Parasitic Battery Test

  1. #1
    Posting Freak
    Join Date
    Oct 2007
    Location
    Milton, MA
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    54
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    763

    Parasitic Battery Test


    I've got something that is a slow drain on my truck's battery. Day-to-day it's fine, but if it sits for 4 or 5 days the battery is dead. The battery itself, and the alternator, checked out fine. Is there a way to do this test without taking it to the dealer?

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  2. #2
    Senior Member cdseven95's Avatar
    Join Date
    Mar 2009
    Posts
    501

    Re: Parasitic Battery Test

    open hood, shut door, unplug hood light if it has one.
    unbolt neg battery terminal put one probe of meter on wire, one of neg post.
    put meter on amps.
    lock door with remote if you have one.
    wait a couple minutes to see if you get a amp draw in range of what is specified for your truck

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  3. #3
    Lifer Garandman's Avatar
    Join Date
    Jun 2008
    Location
    Dorchester, MA / Mt Sunapee, NH
    Posts
    9,905

    Re: Parasitic Battery Test

    Just went through this with the Triumph. They checked across each fuse. Eventually determined the grip heater relay was always on.

    An example.


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