Ford Mustang Forums : Corral.net Mustang Forum - View Single Post - Battery Draining But Parasitic Draw and Alternator Test OK
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post #1 of Old 04-18-2019, 08:36 PM Thread Starter
Imatk
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Join Date: Nov 2011
Location: Texas
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Battery Draining But Parasitic Draw and Alternator Test OK

Having some kind of weird issue with my '91 GT.

The battery will die after about two weeks.

The alternator is brand new and charging at 14.4

Checked the alt with a diode test, checked out perfect... no reading when positive lead was on power post and negative lead was on casing. Reading of .87 when reversed with positive on the casing and negative on the power post.

Checked for parasitic draw and got a reading of .02 amps (or 20 milliamps) which is well within range.

I did test the draw by turning on the car alarm and with the alarm active it stayed at around .027 amps BUT when the alarm was turned off it jumped up to .078 and stayed there.

What am I missing here?

If anyone has any suggestions I'd love to hear them.

Thanks for any help!

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