For the past few weeks I have been fighting a parasitic draw on my BJ8. It was
running about .48 amps and would drain my battery in a day or so. I was told by
a mechanic that a diode in my alternator must have blown therefore causing the
draw. He also mentioned that my ground wires in the boot were loose which he
tightened. I brought the car home, turned off the power in the boot and 2 days
later the battery was dead.
So, hereâ??s what Iâ??ve done. I jumped the battery and started the car and ran
it for 10 minutes. I disconnected the charger and tested the battery - 12.48
volts. I then removed the cutoff switch and bolted the grounding wires
together. I tested for a draw and got a zero reading. That was last night. I
went out this morning (12 hours later) and the battery reads 12.33 volts.
My questions are 1. Is .15 volts a reasonable drop in voltage for a sitting car
in 90 degree heat and 2. Can a diode in an alternator work sometimes and not at
others. If itâ??s either â??good or badâ?? all the time, I guess I need to
presume the alternator is not the source of the draw. If a .15 volt loss over
12 hours is reasonable then removing the cut out switch in conjunction with
presuming the alternator is good (as it works fine now) solved my problem.
What does the wisdom of this great resource think?
Price Lindsay
Cell: 630-841-6300
Email: 050.rpl@gmail.com
Sent from my iPhone
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