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How to check alternator to see if it's good or not?

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One tried and true method is start the car and let it run for a few minutes...Then while its running take the negative off the battery....If the car dies, the alternator is bad

Posted on Jan 03, 2011

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Battery light won't go off on 2007 Saturn aura xe battery checked good alternator checked good starter check good cables are Tight alternator fuse good what else could solve this problem


Have you made sure that the alternator is charging on the car? You should have at least 13 volts at the battery with the engine running.

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Can't get battery light to go off 2007 Saturn aura xe alternator it's good starter is good new battery also check alternator fuse it's good what do to get this working correct


The battery light only comes on when there is a problem with the alternator or the charging circuit. Check all the wires, fusable links and connections. Also a good alternator test will put a large load on the alternator and read the diode tree.

Feb 26, 2016 | Saturn Cars & Trucks

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Alternator checks out good and battery checks out good but alternator does not charge battery is there somethin g else I can check


You have to make sure that you are getting power to the alternator. It could be something as simple as a blown fuse in the power distribution center.

Jul 14, 2015 | Cars & Trucks

1 Answer

My 1991 Dodge ram 1500 ,318 motor alternator is new. Everything grounded Good. But not charging battery. And when I jumpstart it take the jumpin cables off test the battery and alternator with voltage...


My first point to check would be the fusible link for it. Check the wiring diagram in the shop manual and its location in your year/model/VIN and check it. Suspect it was fried by inadvertently arcing at alternator out put lug when servicing alternator.

Jan 27, 2015 | Dodge Cars & Trucks

1 Answer

Good alternator not charging battery in my 1984 toyota celica gts


How do you know the alternator is good?
You need a digital multimeter to check.
With car off check DC voltage of battery, should be over 12 volts dc.
Start car and measure again.
If alternator is good, dc volts should now be over original reading, if alternator is faulty battery is not charging.
If alternator is good you may have a dead cell in your battery, if so replace.
A give away of a dead cell, is that your original reading of dc volts is under 12V.

May 16, 2014 | 1984 Toyota Celica

2 Answers

My car isnt charging the alternator is good the battery is good i took the alternator off and had it checked and its good i put it back on the car and its not working what can i check now and by the way...


check the wires going to the alternator, the large red wire should have 12 volt all the time if not check the fusible link at the starter large post..........the small red wire should have 12 volt all the time if not check the small fusible link at starter large post............brown wire should have 12 volt only when the key is in the run position if not check the charge fuse in the fuse box................good luck

Mar 17, 2011 | 1983 Oldsmobile Delta 88

2 Answers

Battery light came on and stayed on , lights dimmed on the way home, about 5km drive, then when i turned it off it never started again 1997 chevy cavalier


check belt to alternator-if good check wiring and connections to battery and alternator if good than have battery and alternator tested most auto stores offer this service for free ur battery or alternator are not working correctly either alternator not charging or battery not holding charge

Jan 04, 2011 | Chevrolet Cavalier Cars & Trucks

1 Answer

I have a 1998 ford f250 5.4 and it wont charge. its only putting out 11.4v i have checked all the wiring and have good power and ground cables and fuses are all good in the dash and under the hood, had the...


If alternator and battery are both good then it has to be a wiring problem. Check your wiring again at the back of the alternator pay close attention to the connectors that plug in to the alternator. They could be loose. Also check that your battery terminals are clean & tight. Hope this helps :)

Dec 18, 2010 | Ford F-250 Cars & Trucks

1 Answer

2005 ram 1500 truck to replace a fuse for the


I drove the truck to my parent, then i try to start the truck and it won"t start/ Then said its the battery, but then i said let check the alternator. So I put my dads new battery from his jeep to my truck, then the truck started , I pulled out the battery cable then the truck stop. If the alternator was good the truck would still be on right!! Then I take the alternator to pepboy and say it pass the test , that it was good by the test machine, and to check the battery and the fuse that is for the alternator, I try to check it the fuse with a meter and seen okay but couldn't fin the one for the alternator on the truck. I hardly the drive the truck has 32000 mile the truck is a 2005 dodge ram 1500. I think is the alternator cause its making a wierd noise when accellerating. Just burn out and can't think straight.

Mar 22, 2009 | 2005 Dodge Ram 1500

3 Answers

Headlights go Dim


Hi

Check your alternator belt tension, if its ok, all connections behind alternator are good.

If the problem is still there, a new, or reconditioned alternator, seems the only answer !

Good Luck !

Please give me a Fixya Rating.... I need to be a Guru !

John.

Feb 04, 2009 | 2003 Honda Accord

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