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Old 11-23-2011, 04:20 PM
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Car electrical problem causing bad Battery?

Can an electrical issue in car be causing a battery to go bad repetitively?
I have a 1964 Cadillac with airbag systems. I have gone through 2 red top Optima Batteries in the last few months.
One thing I do notice is that when the battery is left connect the car will drain within a couple of days.

Can some sort of electrical problem cause a brand new fresh battery to go bad so fast?

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Old 11-23-2011, 04:44 PM
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If the battery is repeatedly discharged to a very low voltage, yes that would shorten it's life.

Sounds like it is worthwhile poking around looking for what is draining your battery. It takes a pretty good current draw to completely kill a battery in a few days.
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Old 11-23-2011, 07:03 PM
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Did you recently, before the battery drain problem, re-wire or convert the alt in the car? Sounds like the wires going to the alt have gotten crossed somehow and when the car is running it's fine but when you shut it down the voltage sense wire is grounding out thru the internal regulator.
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Old 11-23-2011, 07:22 PM
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I would start by disconnecting the power wire/wires to your air bag system.

If the power draw goes away, trace the power wire/wires to the source at the battery, or alternator. Both power, and ignition on wires may be connected together/shorted, or a faulty relay may be your problem.
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