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Battery voltage fluctuates while in idle - 2001 Chevrolet Suburban

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Check condition and belt tension for alternator. back of belt should be level with the pulley edges if V belt. If serpentine belt check for cracks on the inside of the belt-- Replace if hard and cracked.

Posted on Apr 28, 2013

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Lincoln vantage 400 fluctuating amperage while idling. Could it be bad brushes or the motherboard ?


Could be a faulty voltage regulator internal to the alternator. May also be the charge gauge. Have the charging system tested. If voltage stays steady when tested, chances are a problem on the gauge side. If voltage fluctuates during testing, possible alternator problem and gauge ok

Jan 20, 2016 | Lincoln Cars & Trucks

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Clock goes back to 12 every time it is started back up. Needle on battery meter fluctuates while in idle.


it's mean that the battery current to radio when to 0volt.
find out battery or alternator problems like battery voltage. a load test . or alternator is charging
hope it helps

Mar 17, 2014 | 2004 GMC Yukon

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Battery wont charge, battery/ABS/SRS/BRAKE lights come on while driving and flicker. voltage increases to dash lights/fan speed/headlights periodically.


Get a volt meter, start your car and see how many volts your car is producing while running. Should be around 14 volts. May want to watch the meter for a while since your electric seems to fluctuate. Most voltage regulators are internal of your alternator. If you are getting a lot more or less than 14 volts while running, replace the alternator. If it is not charging, voltage will drop as vehicle runs, until battery is dead.

Dec 12, 2013 | Cars & Trucks

1 Answer

Idle fluctuates on 1995 f250, sometimes dies, sometimes revs, no apparent vaccum issues, IAC with scan tool reads low voltage issue. Could this be vaccum, charging system, faulty computer? Problem is...


Engine stalls cold or RPM fluctuates at idle up and down or dies near idle.

This problem is commonly caused by a dirty automatic idle speed control valve and throttle valve but always run a OBD2 fault code as well as the cleaning procedure. Buy a can of throttle valve cleaner (do not use carburetor spray cleaner!) from NAPA or Carquest (made by CRC chemicals) and spray it into the air intake while the engine is running, use up about 1/2 the can, engine will try to stall hold the speed up, shut it down and let it soak for 30 minutes, restart and blow out the remaining fluid, shut it down and disconnect the negative battery cable for 5 Min's to reset the base idle control. If the above cleaning doesn't cure your issues you need to have the computer controlled automatic idle speed control system diagnosed and repaired by a dealer or electronic engine control repair shop.

Nov 08, 2012 | 1995 Ford F250

1 Answer

Uneven idling on start up. Voltage fluctuates between 11,4 to 12,4 and then stabilise at 13,4 at which idle also stabilize. Gives esp error. C180 W203.


It could be a voltage regulator problem. or even a alternator problem when the volts drop the car looses electrical current causing the rough idle. try replacing alternator.

Sep 14, 2010 | Mercedes-Benz C-Class Cars & Trucks

1 Answer

Car Dies on Idle


Mechanic replaced the MAS. Car still idles a little rough and battery needle gage still fluctuates.

Sep 18, 2009 | 2000 Pontiac Bonneville

2 Answers

98 expedition battery light comes on with increase of rpm


There may be no loss of voltage, but is there a surge of voltage?

As for the battery itself when tested, it should read 12-12.5Volts across the
leads when the car is off. When the car is running, the battery should be reading 13-14Volts across the leads, anything lower means the alternator is not charging your battery, anything higher means the alternator is over charging and damaging your battery.

Another cause for the battery light could be your ECU has detected an error

Aug 20, 2009 | 1998 Ford Expedition

1 Answer

1989 Ford F150 idles rough after start and stalls out some


i have a 1991 f-150 and had the same problem try changing the fuel filter and put gas treatment in the tank alone with fuel injector cleaner if that doesnt work you mite check the fuel pump and see if any rust or dirt is in the tank cloging things up

Apr 15, 2009 | 1989 Ford F 150

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