Question about 1986 Cadillac Fleetwood

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Battery drain after three days its dead,what is the drain

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  • David Gerzseny
    David Gerzseny Apr 16, 2014

    Have it load tested at an auto parts store. You could have a bad cell. Also a short will draw down the battery. Make sure the light under the hood goes off when you clost the hood and all the interior lights shut off properly. How old is the battery,, over 5 years? It sounds to me that it is just not holding a charge which means it is shot!

  • David Gerzseny
    David Gerzseny Apr 16, 2014

    Do you have a gauge instead of just a light on the dash? The gauge should read 14v when the engine is running. Lower than 14 is usually a bad battery cell or the alternator is not up to snuff.



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You can check with a 12v test light or an amp meter. If you take off one of the battery terminal ends, (preferably the negative) and run the test light or amp meter in series from the battery post to the cable end, see if it lights up.

If it does, then you will want to start pulling fuses one by one until it goes out. When it goes out, then that is the circuit that is causing the draw. If not, then the battery is bad, as it can't hold a charge.

The recommendation for maximum parasitic drain is around 30 mA (0.030 amp). A typical drain today actually falls into the 7-12 mA range, even though some vehicles do approach the maximum. Multiply the drain (in amps) by the time (in hours) the battery sits without being recharged. The result is the amount of AH consumed by the parasitic drain. The actual drain may be small, but over time the battery grows steadily weaker.

Just remember to keep all of the doors closed when you do this and disconnect the hood light if there is one, thanks

Posted on Apr 15, 2014


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