Question about 1998 Chevrolet S-10 Pickup

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My battery gauge fluctuates when the rpms are high and between gears if i dont shift soon enough. All lights inside also dim. I had the alternator tested and its ok. Battery is new. Any ideas of what it could be??

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Check earth lead from battery witch runs to car body then to engine block sounds like a bad connection along this cable
hope this helps

Posted on Dec 10, 2009

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Posted on Jan 02, 2017

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1 Answer

Battery charge


This usually indicates the battery has a shorted cell. Here is how you can test it. With the engine not running, take a digital voltmeter set to volts function and read the battery voltage. It should read at least 12.3 volts. If the first two digits are 11, then your battery is bad. If you show a battery voltage over 12.3 volts, then you probably have a bad alternator. Beyond that, I need more details, like, does the engine crank ok? Are headlights dim when engine is stopped? What does "battery gauge very high" mean? What is the make of the vehicle?

Jan 03, 2017 | Cars & Trucks

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Battery gauge moves back and forth between 13.9-14.1 and drops way down when using power windows. dash lights dim a little then go back to normal over and over.


was not uncommon to read this way on some GM products. Its ok. Now if the head lights pulsing while engine is running Alternator is going bad. Should have alt replaced and Battery checked. There are Diodes in the alt and when 1 or 2 go bad the pulse you see is alternating(AC) currant going through you direct current (DC) system. Can mess up a battery if not cought soon enough

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95 GMC Jimmy two wheel dr the battery light will come on during shifting. Volts will go down and lights go dim. After it shifts gear it would go back to normal. Will repeat during shift gears or rpms...


like I see the problem ,the most common is belt not tight enough or alternator or battery
with a voltmeter check the battery voltage more then 13 volts. test battery with a load test

Sep 28, 2013 | 1995 GMC Jimmy

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1997 bmw 328i dash lights all lit up at once and after several minutes they faded, and eventually the headlights and dashboard lights dimmed.


Alternator. Have it tested with a voltmeter while on the car and running. Or take it off and have it tested. The current to run the car and the accessories is from the alternator when the engine is running. The battery light coming on alerts you that the alternator is not doing its job.

Dec 06, 2012 | 1997 BMW 328

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2000 Mazda Protege LX 1.6. Recently changed Rad, Alt, Batt. Now when i am at a red light and the car is idling, the RMP's fluctuate between 1-0. As soon as the needle hits 0 the car stalls. Oil light and...


start the car but do not drive it. look at the belt when it is running. if belt hops around then the tensioner is bad and not holding belt tight enough. or the belt itself may be bad. alo check for a bad idler pully for the belt.

Apr 18, 2011 | 2000 Mazda Protege

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I was driving and lights went dim. all gauges shut off. soon after I lost all power. when I try to start it the lights dim in and out and there is a loud clicking under the dash. I checked the alt. and...


These are all classic symptoms of a failing alternator and a car running off the battery. If the alternator and battery test good then you have a loose of broken wire in the charging circuit. When you get the alternator tested make sure they take a reading with everything electrical turned on in the car to make sure the alternator still produces. Sometimes a diode will fail inside and while it may charge good normally, it won't when it has to produce extra power. Hope this helps.

Dec 19, 2009 | 2001 Oldsmobile Bravada

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Recently i hear noise coming from under the hood, when my rpms are high, the gauges start dimming. Could it be my alternator? Belt looks good. battery gauge level is right.


If the lights go dim while driving then the charging lights should come on and that means either the relay is braking down or the regulator in the Alternator is braking down .
Its quicker and cheeper to get it checked out by a elect shop than buying a Alternator and still having the problem after, as the alternator should charge about 13.5 volts while running.. Ron

Nov 23, 2009 | 1998 Chevrolet S-10 Pickup

1 Answer

1995 Subaru Impreza WRX engine problem


Alternator?
Voltage Regulator?

If the noise sounds like a weeeeeee that increases in pitch as the RPMs increase, and you haven't heard this sound before the 'problem', suspect the alternator...

Mar 12, 2009 | 1995 Subaru Impreza

1 Answer

Headlights and interior lights flicker


we had the same problem there is a small line that connects itno the alternator, it kept jiggling loose. we found a way to tighten it and the problem went away

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