Question about 1983 Ford F150

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Drains power and shuts off while in motion, new battery and alt

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Check the voltage on the battery connectors with a multimeter, while engine is running. You must see at least 13.5 V DC.
If not, you alternator is not charging. If yes, you have a short circuit somewhere and a big one, or some tremendous power consumption, ( car audio, amplifier, you know better).

Posted on Sep 08, 2010

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My 2007 Chevy silverado battery keeps draining. I thought it was from the radio not shutting off when I open the door but I shut the radio off and the battery still drains. What can be draining it?

The battery itself may have an issue? You could try disconnecting the cable when you park and see if something is truly draining the battery. If it is you may notice a slight spark when you disconnect the cable. The alt may have a bad diode so it will charge the battery but drain it once the motor is shut off? Or it could be something like you suggested. The radio remembers its settings by being connected all the time. However a stock radio does not take much from the battery.

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Battery and alternator is good,but the break light,srs air bag light and the battery light stay on all the time and the car will go dead while in motion. what could be the problem?

Your alternator cant be good if all those dash lights are on then the alternator is bad, reoplace it and make sure the battery is tested, a bad battery can and will destroy a new alternator, also make sure the connections at the rear of the alternator are good, the reason for car dieing in motion is due to the battery draining down and theres not enough voltage to keep ecletrical components going, you must have a bad connection at alternator or alternator is bad. and the last thing to check would be the alt fuse which should be located near the postive battery terminal. good luck.

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My 91 firebird battery keep draining put new alt on test fine new battery fine drove it for a half hour and it died again whats wrong

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Battery keep draining down

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My 1990 Ford Taurus has a battery drain problem. I'm not sure what is draining it but I just bought a new alt. and new battery and the next day the new battery was dead and I had to jump it. Could it be...

I fixed the same problem in my 1990 Ford Taurus, it turned out to be the external voltage regulator.
I determine that my external voltage regulator had failed by testing the charging voltage across the battery while the car was idling. It should be a maximum of 15V for most batteries; mine was at 17.8V which means the voltage regulator was not regulating the voltage sent to the battery. Also when the car was parked it pulled a constant 3.0 amps (which drained my battery overnight). I was able to test for the amperage draw by just disconnecting the voltage regulator and hooking up my multimeter in series with the battery, the draw was gone.
I replaced the voltage regulator, which is a very easy fix, and I was good to go again. :)
Hope this helps someone too.

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Battery drains on 1989 Buick Electra. New Battery and New Alt. No lights staying on In the hood, glove box, truck or inside. What could cause this?

Its hard to say really it could be a number of things.

From my experience, id almost always go tot he power antenna first. This things always break stick bind etc and when they do they cause a nasty battery drain.

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Replaced alt. and put new battery in and it's still draining battery even without lights or anything else being on.

make sure your ignition switch is really shutting off and not staying on even though it looks off

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New alternator didn't charge battery. (2VDC

As the car re-started, the battery is not flat.
The voltages measured indicate a problem with either the power or ground connection in the circuit between the alternator and the battery.

You likely have a intermittent / poor ground connection somewhere in the power system.
Check battery terminals are clean and firmly attached.
Check battery cable and alternator ground connections are intact and in good order.

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