Question about 1994 Honda Civic

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High idle battery lght

Replaced ad battery and alternator now have high idle and batter light is on at idle but goes out as soon as i give it a little gas

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Found out that motor mount was missing bolt and other was loose which affected alternaror belt tightness alternator wasnt spinning at high enough rpm onceit goes under 1400 it will triger light to come on

Posted on May 19, 2009

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Posted on Jan 02, 2017

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1 Answer

Battery light flashes and engine cuts out whilst driving.


Has to b the battery,if you changed the alternator then the batter isnt supplying any power to your sensors and computer. if your battery is weak the car might run at idle, but as soon as your drive your useing more draw. swap out a battery from a friend and you should b good.

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To remove the lead from the battery to the alternator while it is running is to invite a destroyed alternator . Varying voltages with engine RPM is indicative of a bad battery or problem alternator regulator . Have a load test done on the battery to check for cell problems and have the alternator bench tested to check the performance .

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1 Answer

Battery voltage


You will need an alternator that will handle the total load of all the electronics and electrical units in the car. Most cars run either a 60 amp or a 90 amp depending on if you have heated seats and all that extra load.. The wrong amperage alternator will not give starting problems so run fault codes for that. You can gauge if the alternator is big enough by fitting a volt meter across the batter and by running everything (Lights seats etc ) and watch the voltage gauge to see it the battery voltage slowly goes down over a period of time . Going for say an 2 hour drive would give some indication. The alternator will keep a charge on 14.5-15 volts and when you let it idle the battery voltage will be less than 12 volts indicating that the alternator is not supplying all the required current and the battery is putting in some current as well

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1 Answer

Engine has light failure on minimum rpm when proper temperature engine


better get a new battery soon. You are close to being stranded. Dim lights also indicate the alternator is getting tired. A new battery might fix alternator output but if batter isn't getting recharged, replace alternator too.

Jul 31, 2013 | 1991 Volkswagen Golf

1 Answer

Hi I have a 2005 peterbilt 379. I have replaced battarys and alternator and it show it charging good as soon as I turn on my head lightsthe volts go down 12 on my gauge when I hit a bump its back to 14...


Depending on the output of your alternator, and the rpm range of your idle. will determine how much and how fast the alternator works to charge your batteries.

as well as having inverters attached to your batteries that draw juice from these batteries as well as your lights.

look into adding or changing your trailer or marking lights to LED it will help on the draw from your electrical system.

Aug 31, 2011 | 2000 Chevrolet 3500

1 Answer

Charging stystem seems to be working..... But when ever the miss's gets inthe car to go to work,she will get 10 miles and the battery light will start flashing,then get solid and she will lose the head...


When this happens, are the gauges dropping or not working properly or at all? Check the alternator. May not be charging so everything is running off the battery. The battery is used mostly for starting, but the alternator recharges the battery, so if after driving for a short while, and alternator not charging, everything electrical will drain the battery. You can sometimes drive the car for a while when this happens, or if the alternator goes out completely, the car will not run at all.

Aug 28, 2010 | 1991 Chevrolet Corsica

2 Answers

Squealing losing power not chargeing batter changed alternator


If the belt is 3 yrs old or older, change it. If it has oil or anti-freeze or grease on it, change it. If new, add more tension to the belt.

May 13, 2009 | 1994 Isuzu Rodeo

2 Answers

Battery Light


You probably need a new alternator and battery. If you have a DMM (Digital Multi Meter) Check the Charging system voltage at idle, it should be around 13.2 volts or above for a properly working Alternator. The battery voltage with the car off should be at 12.6 volts for a good battery. Check and replace as neccessary.

Dec 03, 2008 | 2004 Ford Mustang

1 Answer

Check gauge light comes on?


How does the battery voltage gauge read at idle? Is it below 14v.? May be a drained battery or an alternator malfunction.Hope this helps.

Nov 29, 2008 | 2000 Jeep Grand Cherokee

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