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Old 10-20-2013, 09:07   #1 (permalink)
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frown 07 Taurus mystery bat drain or charging circuit?

Charging light came on intermittently. For about two weeks. Seemed to come on spontaneously then go off with a braking movement. Then one morning it behaved as if the battery was dead. Starting solenoid clicking, etc. . Recharged it at an uato shop and an hour later a load test showed it was at 63%. Replaced the battery. Seemed to work fine for a day. The next day ... I used the car and towards the end of the day the battery appeared to to be low again. Funny clicking sounds for the instrument cluster, lights were dim, crazy warning signals come on and off; check breaks, air bag, etc. turn signals weak, heating/cooling sys wouldn't come on. Then the engine died.

Haven't checked any fuses or the charging system. Could the battery be draining through a short? That quickly.

What should be checked next?
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Old 10-20-2013, 09:42   #2 (permalink)
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Re: 07 Taurus mystery bat drain or charging circuit?

Check the alternator. The battery light coming on indicates a possible charging system fault. The weak battery is another indication of a charge fault.


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Old 10-20-2013, 10:30   #3 (permalink)
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Re: 07 Taurus mystery bat drain or charging circuit?

As suggested , check alternator output . If o.k , check for a parasitic drain on battery .
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Old 10-20-2013, 12:15   #4 (permalink)
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Re: 07 Taurus mystery bat drain or charging circuit?

A bad diode in the alternator can also drain a battery pretty fast and show normal and still charge when running.

A diode allows the current to flow in one direction. If bad it will keep charging circuit hot with the key off allowing the battery to drain.
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