Question about 1991 Ford Aerostar Extended

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Battery light turns on when i accelerate and the gauge rises to 18 volts

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Your altenator is over charging

Posted on Dec 31, 2008

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Fuel gauge goes down at stop but rises again when accelerating.


Needle should move a little bit upon stop/go.If it is a lot would have to say it is the potentiometer in the sending unit fuel pump.

Jan 05, 2014 | 2008 Chevrolet Chevrolet Malibu Classic LS

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Battery keeps dying on my legacy 3000 i dont think its battery


Get a cigarette lighter voltage gauge and watch the voltage.

It should never go below 12 volts before you crank the engine, or after you turn it off. If it's above 13 volts after you shut it off and below in the morning, the battery is on it's way out.

Right after you start it, especially in the morning, the voltage should rise to 13.8 or 14.8 volts and then drop back down to 13.2 or 3 as you drive. If it doesn't you have a charging problem.

Definately remove and replace the cables to the battery, the problem is often the connection.

Jul 30, 2013 | Subaru Legacy Cars & Trucks

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High voltage


The volt gauge could be faulty. I would have the alternator output checked first to make sure the gauge is right.

May 02, 2013 | 2000 Kia Sportage

1 Answer

Replaced alternator twice,battery light come on after 1 day and pulls battery down.


Hi.
There's no good news here !
First charge the battery, start vehicle , allow to idle (put volt meter on ) battery voltage should rise . Turning on headlights and observing rise in heater motor speeds or interior light illuminaion on accelleration should be observed ! If the battery voltage does'nt rise , replace alternator (not what you want to hear but has to be done )
So good alternator and running , everything ok. if vehicle fails to start after this, check battery condition and possibly replace.
Good Luck

Dec 13, 2010 | 1999 Mercury Cougar

1 Answer

Oil pressure rises as I accelerate the car/ put my foot on the gas. The service engine light comes on...this has never happened. Its a 93 pontiac bonneville


what does the pressure rise too? Its normal to rise somewhat. I dont think the Service Engine soon light is related to the oil gauge operation.

Jul 24, 2010 | 1993 Pontiac Bonneville

1 Answer

Tempeture hand on gauge rises and falls as you accelerate and slow down. Also rises and falls when you turn on the internal blower in the car. The engine does not appear to be overheating.


The problem you describe is likely being caused by the dashboard earth (ground) reference moving as the 12v power system current draw changes.

Ensure battery terminal post connections are in good order, clean and firmly connected,
Ensure the all chassis, alternator, engine and dashboard ground connections are intact and in good order.
Ensure all dashboard loom connections are properly connected,
Check alternator output voltage (battery terminal voltage) is approx 14.5 volts with engine running, while loaded with headlights or blower motor running.

If all above is ok, the dashboard internal voltage regulator supplying the instruments may be faulty (unlikely - do all other checks first).

Oct 13, 2009 | Hyundai Santa Fe Cars & Trucks

1 Answer

1999 Venture - Intermittently dash gauges (idiot lights) come on.


CHECK THE ALTERNATOR OUT PUT USING A DIGITAL VOLT METER.IT SHOULD BE 13.5 TO 14.5 VOLTS.IF NOT REMOVE IT HAVE IT CHECKED AT ADVANCE AUTO OR AUTO ZONE.THEY WILL CHECK IT FREE.DUE TO LOCK OUT FEATURES.BESURE TO TURN OFF RADIO.BEFORE REMOVING THE NEGATIVE BATTERY CABLE.SO YOU WONT LOSE RADIO CODE TO PLAY RADIO.

Aug 17, 2009 | 1999 Chevrolet Venture

2 Answers

Alternator may be overcharging?


Yes It sounds like the voltage regulator inside the alternator has gone wide open .It can also ruin your battery and explode the battery.I would have it hooked up to a alternator tester and just to make sure it's not just your gauge.hope this helps

Jan 24, 2009 | 1999 Chevrolet Silverado 1500

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