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Battery trouble light stays on, alternator is charging at 14.6 volts with new batt

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14.6 volts sounds a little bit high. I would have the alternator tested. Sounds like a possible voltage regulator problem.

Posted on Apr 30, 2010

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96 cadillac eldorado etc battery not staying charged when the car is started the battery goes up to 14 when driving and press brake voltage drops 11-12(car may even die) and to 13+ if u give it gas


Does the vehicle start after sitting over night or do you need to jump start it . Is the charge light on ( batt. symbol ) at any time ? Serpentine belt good , tensioner good ? Battery cable connections good an tight and no corrosion ? Battery also good ? That is normal for battery voltage to jump up to 14 volts after starting , alternator is replenishing the battery after starting ,that draws down the battery . Going down to 11 or 12 volts when stopping and almost stalling isn't a charging system problem . You have a idle problem , IAC - idle air control valve or dirty air passage , a vacuum leak . Giving it gas and it going up to 13+ the alternator is working . Your best bet take it to a qualified repair shop and have it check .

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1 Answer

Can alternator put out 14.2 volts but not enough amps to charge battery and turn off dattery light?


Yes and no.
It sounds like you have a wiring problem.
The alternator output could be 14 volts and only one or two amps, but that would be enough to kill the warning light. Its more likely the alternator is charging but the current is not reaching the battery.

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1 Answer

Battery light on, got new alt., starter tries to engage, but doesnt


Did you have the charging system diagnosed or did you just guess at it being the alternator . The charging system is computer controlled . The starter isn't working because low power , battery dead . Is there B+ voltage at the wire on the back of the alternator .B+ voltage at pin 3 at the connector pluged into the alternator .
Charge the battery use a volt meter an test for B+ voltage at the places i mention . No check engine light ? DTC'S - diagnostic trouble codes stored .
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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.

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2 Answers

Hello, MY 2005 Nisan frontier will not start. About 3 days ago, the battery light would stay on after the engine started...had the battery checked and it was fine...then serviced it yesterday but it still...


Battery might seem fine on a routine check, but the crancking amp power is not there anymore, seems that your alternator is not charging it anymore, have the alternator checked and replaced if needed, the battery might need replacing too.

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1 Answer

I put a new battery and a new altenator,and the red battery light still on, I've check it with a tester it stays at about 10 volts


Your alternator should putting out 14-14.6 volts with engine running.If you only have 10 volts with engine running then your alternator is not charging take alternator back for a replacement.

May 22, 2011 | 2002 Oldsmobile Alero

1 Answer

Batt light came on flickering after a month rest I changed 3 year old batt. now light steady on is there a fuse for charging syst if not what could be the problem thank you


I would be willing to bet you have a bad alternator. This is the most common problem for the light coming on. Check to see what the voltage is at the battery and then at the B+ terminal at the back of the alternator. You should have around 14 volts in both places. If you have 14 volts at the alternator and not at the battery then you have a bad wire or fusible link in the wire. If it is closer to 12 volts in both places, then you most likely have a bad alternator.
Hope this helps. Good luck!

Apr 13, 2011 | 1998 Ford Escort

3 Answers

On 92 honda civic the battery light stays on. Is


No your alternator is not longer working correctly. It could be as simple as a broken alternator drive belt. Open the hood an see if you see any naked pulleys. If the belt is in place then you most likely with have bad alternator. NAPA and Autozone have stores that can test your old alternator. Con comeone into removing it and have it tested. If it is bad get a REBUILT one. A new one will cost a small fortune!

Jan 21, 2010 | 1992 Honda Civic

1 Answer

I have a 1989 fordf350 deisel batt light stays on


I would check the plug going into the alternator. They have been known to fail at times. I would also check the fuse for the alternator if equipped.

Apr 25, 2009 | 1989 Ford F 350

1 Answer

When I turn the ignition on the battery light comes on and the voltage gauge drops between 9 & 14. Then it slowly goes up to around 14. I replaced the battery. Alternator??


take volt meter check voltage on batt.while truck is idling,voltage should be between 13.5-14.5v,turn headlights on it should stay in that range if it goes below,check for bad wire connection at alt.,if conn. are ok,theres a good chance alt. not charging properly!before doing test make sure batt.is full charge!

Apr 19, 2009 | 2001 Chevrolet Silverado 1500

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