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Gud am, my battery is not charging due to my the alternator not working. a check showed a test check showed that alternator steady at 12.5 volts

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Should be at 14 volts

Posted on Apr 28, 2015

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Alternator is overhauled, still not charging. But batterylight on revcounter doesnt light up when ignition is switched on.


Check the voltage at the alternator big wire. 14 volts? check at the battery, 12 volts. The wire is corroded or bad. If the alternator lead is showing battery volt(12) check the alternator plug. Pull it off, With key on it should show 12 volts one one wire and ground on the other. Takes at least test light to confirm this

Jun 25, 2016 | 2000 Alfa Romeo 156

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What would cause the battery gauge on a 93 jeep grand Cherokee Laredo to bounce between 14v and 9v. this is also running the battery dead and not charging the battery back up.


Several things need to be checked before an accurate diagnosis can be made, however in general it is most likely your alternator going out OR a bad connection in your alternator/charging circuit wiring.

It's also important to test/verify that you have a good fully charged battery (with no dead cells) before any tests of the charging system. An alternator needs ample battery power into it before it can produce good charging voltage and amps out of it and back into the battery.

If you test the voltage directly out of the alternator's output post/connector (with the output wire disconnected), you will be reading direct alternator voltage output, which should be approx 13.5 to 14 volts, steady. If the voltage is at ~14 volts, then suddenly cycles down to 9 volts (or anything less than 12 volts), then you have a defective alternator.
If the alternator, while isolated, tests out at a constant 13.5 to 14 volts, then the problem is most likely a bad wire or connection in the charging circuit wiring.

There is also the possibility of the battery (how old is it?) shorting out internally, causing the voltage fluctuation. That's why I previously said you need to verify each battery cell is fully charged and good. You can usually test this with a battery hydrometer (if it's not a "sealed" maintenance free battery).

Nov 05, 2014 | Cars & Trucks

1 Answer

2003 bmw x5 4.4 battery light stays on


Brother Mark, changing the battery with a new one being done won't make the light go out, as you noticed. Light is still on so you changed the alternator. Good, but the battery light is STILL on. This only means that the charging circuit from the alternator is not working in the voltage regulator or the wiring is not connected properly to the alternator/regulator. A new battery will show over 13 to 13.5 volts not connected. An old battery will still show 12 volts and still be weak or bad. After connected and engine running, the system will show at least 14 volts because alternator/regulator is working properly, using a voltmeter/load tester connected to the battery. If after replacing the battery and alternator it is still reading 12 to 13.5 volts, it is not working and the light will stay lit on the dash. You may have purchased a faulty alternator if the system tests out this way. Have your system checked with a volt meter or load tester bit be sure all the connections are proper and clean.

Mar 26, 2014 | BMW X5 Cars & Trucks

1 Answer

Alternator Test? My main fuse blew out and my alternator does not seem top charge. I did a load test and the battery is not charging. Before I spend the shop money, how would I check the alternator to...


Check the voltage of the battery with nothing on, it should read 12 volts.
Start the engine and check it again with a few revs. It should read 14 volts.
If it does not then it is not charging. If it does and the battery stays flat, then you have a problem with the battery.

Aug 29, 2011 | 1996 Chevrolet Lumina Mini

2 Answers

I think I have an alternator problem? The charge needle on the dash guage is spiking to 16 volts off and on. I put a voltmeter to the battery and it is only charged to about 11 volts. With the engine...


Hello
The normal charge of alternator on idling is about 13 to 14 volts. 12 is acceptable but keep in mind it will need attention soon. The needle fluctuates due to the revs of the alternator - there is nothing to worry about. Just look that the charge is always above 12V on idle.

Jul 14, 2011 | 1996 Dodge Intrepid

2 Answers

'96 cadillac eldorado battery they say is gud but


The battery discharge rate must be checked along with the charging current to confirm the working of the alternator.
Please check the link below for tips.


http://www.fixya.com/cars/r5824824-draining_car_battery_charge

May 17, 2011 | 1996 Cadillac Eldorado

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Have a 89 suberban and the alternator and battery test at autozone is showing good but still not working. Cleaned termenals grounding is good. How do I check if the small 1 wire on the altanator is working...


With key on,it should read 12 volts,now check the large wire on the back of the alternator with key off,it should read 12 volts,if it does not,then ,it is not getting voltage from the battery,just run a wire,the same size,or larger on the back,along with the other wire,all the way to the battery positive side.This will solve the problem.If the small wire is not getting voltage from the ignition switch,then there is a fuse blown,or the ignition switch is bad.You can run a wire from the fuse box,to the alternator,just make sure it is on a fuse that just has power with key on,not off.If this was at all helpful,please rate,thank you.

Jul 31, 2010 | GMC C1500 Cars & Trucks

1 Answer

What is the expected output of a alternator in a Jeep 4.0L Sahara (yr. 2000)? My Jeep's ''check gauges'' light came on, and the battery gauge dropped to nothing. Checked the alternator (with a voltage...


You shoulld expect more than 12.8 volts from the alternator up to nearly 14 volts when charging a low battery. The battery can only show the amount of voltage your alternator is sending to it after being used for a while. I would suggest that you have the battery tested & recharged completely, your voltage will be above 12 volts and if it returns to below that , you will know your alternator is not charging. Also, if you test the output of the alternator and see it is below 12 volts after the battery is fully charged at 12+ volts you will have confimed the problem also.

good luck.

Jan 31, 2010 | 2000 Jeep Wrangler

1 Answer

Charging problem 1991 volvo 240


14.6 means your voltage regulator or diode is suspect Despite having new alternator .Ive cross refrenced your smptoms in the haynes workshop manual and alternator is your only end answer.The haynes test is to start vehicle with multi meter connected across the battery terminals,increase the engine speed until the reading remains steady should be approximately 12 to 13v and no more than 14v.switch on as many accessories as possible(headlights heater blower radio etc)check that the alternator maintains the regulated voltage at around 13 to 14v.If the regulated voltage is not as stated then alternator is to be repaired/replaced.Good luck with it and a happy new year.

Dec 29, 2008 | 1991 Volvo 240

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