Question about 1990 Mercury Topaz

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Will only run as long as ther is juice in the battery,but the alternator is good....runs good as long as batt holds out

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How does the battery get its charge??from a BELT driven alternator.........clue....

Posted on Jul 30, 2010


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5 Answers

Can a bad alternator cause a battery to die overnight?

A bad alternator no longer charges the battery, the battery will die once it is drained. This will occur more rapidly when using equipment that runs off of the battery( lights, heater blower, windshield wipers etc.) even electronic ignition will run down a battery. Your battery just went over night the alternator may have stopped working long before. Go to an auto parts store that offers free testing to make sure it is your alternator before making repairs.
Good luck.

Apr 20, 2015 | 2003 Chevrolet TrailBlazer

1 Answer

Battery won't hold a charge, battery and alternator both check good. Where is the voltage regulator at on these vans?

Hey Rick ,I don't know what you have so it makes it harder to help you ,I don't dough you checked battery and alt . unless you have a dead short the battery should hold a charge , as far as the alt. most have an internal built in regulator , start the vehicle when its running disconnect the battery if it dies its the alt .

Nov 07, 2014 | Cars & Trucks

1 Answer

Chevy venture draining battery

The alternator is out. The ONLY time your vehicle uses battery power (while the engine is turning) is during start up. After that the alternator runs the car.

With the car running put a volt meter on the alternator. Red lead on the big nut on back side if alt. Black lead on the neg batt cable or a good body ground. Voltage should be around 14.5v DC.
Then still with engine running, red lead to batt postive, black lead to batt neg. Voltage should read the same. 14.5v DC
If not, the alt. Is bad

Dec 31, 2012 | 2002 Chevrolet Venture Passanger

2 Answers

01 Kia Sephia charging system won't keep car running. Alternator and battery are both good. Is there a fuse that connects the two?

have you tried cleaning the batt terminals and make sure the plug on alt is in and the bolt that holds the one wire is tight in the alt

Jan 19, 2012 | Kia Sephia Cars & Trucks

2 Answers

I connected the wrong battery cables in my car reversed pos & neg my battery is not getting recharged from my altenator i had the altenator tested at three different stores it tested ok Im told it that...


Check the Alt. Fuse in the engine compartment fuse box, if Ok, take vehicle to an AutoZone or Checkers store and have them check your charging system,

I think the battery is toasted and/or the alternator regulator is not working properly. If the alternator and battery test fine, then your problem could be a broken, burned out or loose wire.

Don't forget to rate this post!! Good Luck!!

Jul 16, 2010 | 1992 Dodge Caravan

1 Answer

Alternator is not charging the battery. The battery has been tested & will hold a charge. The alternator has been tested and is also good putting out 75 amps. I've checked the connections, all appear...

thats not always a great way to diagnose alternator problems if you have alot of electrical components on your vehicle the alt will not run the vehicle,also the alt. is not going to charge your batt. its job is to maintain your batteries life, if you do not have a load tester to test your batt. have some one at a autoparts help you most are free of charge to check.. goodluck

Mar 10, 2010 | 1989 Ford F 150

2 Answers

On my 1998 Toyota Corolla, after it starts and runs turn the key off and it will not start again without a jump. After a quick jump it starts right away. The battery is only a year old. Is it the...

Check for loose battery terminals. Car will not start without jump because battery is not connected properly. Starter is probably good or car would not start with or without jump. If alternator is bad and not producing current, car would die after running a short while as battery would out of juice and without alternator current the car would die - so probably alternator is good. If connections are all good, get a voltmeter and test the battery voltage - it should be over 12.75 volts. If not, battery is not holding charge.

Nov 16, 2009 | 1998 Toyota Corolla

1 Answer

Peugot expert van draining battery when everything is switched off When jumped started the battery charges quickly, but switch off the engine and in ten minutes the battery is totally drained. Help greatly...

either change the battery or the alternator,,just either of those,,,if your battery is no good it wont hold charge when started,,,also if your alternator is no good it wont charge your battery when engine is running,,,(it can also drain your battery if faulty)..get a second hand alternator in a breakers yard maybe a batt too much cheaper,,,hope i helped you,,

May 08, 2009 | 1991 Peugeot 405

2 Answers


it is very rare when a bad alternator will stop a car from starting as the car will start and run until the battery runs out of juice however if it is shorted it could fry other components in the electral system. I am assuming you have already tried to jump start the car and it didnt start so if it is shorted then the welding is already done. check to see that the battery has juice and try to start the car more often than not if there is no turning or starting even while jumping its the ground wire on the batt or the frame thats loose. good luck

Mar 24, 2009 | 1990 Honda Civic

1 Answer

Car running off battery, altinator is good.

try starting your car and letting it run for a min disconnect the bat and if it dies then you need to find a bad wire or a bad ground to the alternator. something might not be telling it to put out any power to re-charge your batt

Mar 24, 2009 | 1993 Oldsmobile Cutlass Ciera

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