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The battery light comes on and goes off intermittently. I've been told alternator is good. Battery is 2.5 months old.

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Loose battery cable

Posted on Apr 21, 2015

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And if you ruled out a wiring problem, check belt and tensioner

Posted on Apr 21, 2015

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1 Answer

Battery light comes on while driving. Immediately after water pump/timing belt replacement. Replaced battery and alternator tests good. Intermittent battery light remains?


It sounds as though the belt may be slipping or is not tight enough?

If it's a toothed belt it won't slip - it may not be tensioned enough where it goes around the alternator pulley. They are adjustable.

A smooth non-toothed belt can slip.

Also, check the tightness of the battery leads where they connect to the battery and to the earth - on the bodywork/engine block

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Alternator tests good wont charge battery


I'm sorry to say it could be the computer.
The computer controls idle speed as well as alternator output.
If the check engine light is on you should get it scanned for trouble codes.

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2002 volkswagen Jetta wont start or crank, when you turn the key the cars does absolutely nothing. No lights come on or anything. Then it will start if you leave it sitting for a while sometimes, but when...


It's possible you could have an intermittent problem with ignition switch. If the battery and alternator were tested and came back fine there has to be a bad connection somewhere.

Sep 03, 2011 | Volkswagen Jetta Cars & Trucks

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Battery light was flashing on dash,alternator was charging intermitently,had alternator tested on car and told diodes were bad.went to get it rebuilt and told its good.I need suggestions on what to check...


There isn't much to the charging system on any vehicle. The belt spins the alt copper binding and creates eletrical current. That current goes directly back to the battery. The other wire goes to the gauge in the dash. I would replace the alt. If you said it was intermittent and it tested good at the rebuild shop who is to say that wasn't one of it good times? Easy way to find out how good it is. While the car is running unhook the possitve terminal from the battery. If its good the car will stay running. If it isn't the car wont.

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1 Answer

2008 Pathfinder with a 2 month old battery , kept trying to start but couldn't until battery was dead, mechanic jump started like nothing so replaced battery now and it skipped and spottered from a...


INTERMITTENT BATTERY DRAINS ARE HARD TO FIND. TURN OFF ALL SWITCHES IN THE VEHICLE. MAKE SURE THE GLOVE COMPARTMENT LITE IS GOING OUT. OPEN THE HOOD. CLOSE ALL THE DOORS. MAKE SURE ALL OF THE COURTESY LITES ARE GOING OFF. DISABLE ANY UNDER THE HOOD LIGHTS. REMOVE THE NEGATIVE BATTERY CABLE. USE A 12 VOLT TEST LIGHT, FASTEN ONE END TO A GOOD GROUND, { METAL PART OF THE MOTOR} . FASTEN THE OTHER END TO THE NEGATIVE TERMINAL OF THE BATTERY. IF THE TEST LIGHT LIGHTS UP THERE IS A BATTERY DRAIN. IF NO LIGHT , NO DRAIN. IF THE LIGHT IS ON LOOK IN THE FUSE/RELAY BOX NEAR THE BATTERY. PULLOUT THE FUSES, LARGE & SMALL ONE AT A TIME, IF THE LIGHT STAYS ON PUT THE FUSE BACK IN TRY THE NEXT FUSE. WHEN THE LIGHT GOES OUT, THAT IS THE CIRCUIT CAUSING THE DRAIN. IF IT NEVER GOES OUT, DISCONNECT THE ALTERNATOR. IF THAT MAKES THE LIGHT GO OUT, THERE IS SOMETHING WRONG WITH THE ALTERNATOR. IF THE LIGHT IS NEVER ON, YOU MAY HAVE TO DO THIS ANOTHER DAY TO FIND THE DRAIN. ALSO HAVE THE NEW BATTERY RECHECKED.

Jan 12, 2011 | 2008 Nissan Pathfinder

1 Answer

Battery drains when car is on. Verified it is not


Sure sounds like a bad alternator to me-how did you verify the alt is okay? It should be putting out around 13.5 volts. Let engine idle-remove positive battery cable-if engine dies immediately, it IS the alternator.

If the alternator only puts out about 12/13 volts, the car's voltage consumption could be exceeding that; hence, intermittent charge/battery light.

The battery has 12.6 volts. The battery/charge light will come on if your car's voltage requirements exceed that. (Alternator pulley not spinning fast enough?) Loose alternator belt slipping could also cause this symptom.

Alternators CAN go inoperative intermittently.

Hope this helps.

Dec 31, 2009 | 2000 Jeep Cherokee

3 Answers

Battery light comes on intermittantly while driving I had the battery tested and alternator everything was fine???Is it safe??


You have an intermitt issue. Test battery voltage when light is on. More than likely alternator (also check the belt that drives it) or poor battery connection (must be clean and tight).

Nov 21, 2009 | 2006 Ford Focus

1 Answer

97 Chevy Blazer - good battery, good alternator...still dies???


check battery voltage when you turn off car. it should be 12.5 volts.if drops 11.0 volts the battery is got a weak cell in it.i bought a sears die hard battery it last 2 years the battery had a defect .it had a bad cell it short out the battery.check alternator wires for defects.

May 29, 2009 | 1997 Chevrolet Blazer

1 Answer

Battery discharge intermittently with brake light coming on too


Check all wiring connections to alternator and battery to insure all are good, if ok it will most likely need an alternator.

Nov 30, 2008 | 1990 Toyota Pickup

2 Answers

1991 ford ranger battery light


bad battery module for the light or a dieing cell in battery

batterys can be tested and wont show a dead cell at all but you will be told that the battery good
most batterys are refurbished batterys sometimes getting the luck of a good battery is 50/50 chance

heres a way to test the battery and alternator at the same time
start vehicle
disconnect battery positive post
if vehicle dies the alternator is at fault if vehicle doesnt die its the batterys life dead cell

Jun 11, 2008 | 1991 Ford Ranger Supercab

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