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1981 eldorado alternater not charging at stop sign with heater on and head lights on but on high way speeds ok 14 volts on high way and a little over 12 volts at stop sign

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You are using more power than it can handle,it is all right.

Posted on Apr 23, 2017

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Why does the voltage drop to battry volts when i put the gear lever in drive?


the voltage should remain at 14.5 volts at all engine speeds above idle 13.9 volts at idle indicates that the alternator is charging but not at set voltage
head lights are the biggest drain that affects charge rate rate and it it maintains and from you description that is not a problem
when you select a gear it indicates a heavy drain which is a high resistance or a dead short in that circuit that is taking out more power than the alternator is charging
There there is nothing in the gear selection that draws such power
the other thing is that when selection a gear the engine rpm is tool low and the alternator stops charging
for auto vehicles , the idle rpm should be at 800-900 rpm dropping to 750-800 in drive

Jul 08, 2017 | Ford Cars & Trucks

1 Answer

96 cadillac eldorado etc battery not staying charged when the car is started the battery goes up to 14 when driving and press brake voltage drops 11-12(car may even die) and to 13+ if u give it gas


Does the vehicle start after sitting over night or do you need to jump start it . Is the charge light on ( batt. symbol ) at any time ? Serpentine belt good , tensioner good ? Battery cable connections good an tight and no corrosion ? Battery also good ? That is normal for battery voltage to jump up to 14 volts after starting , alternator is replenishing the battery after starting ,that draws down the battery . Going down to 11 or 12 volts when stopping and almost stalling isn't a charging system problem . You have a idle problem , IAC - idle air control valve or dirty air passage , a vacuum leak . Giving it gas and it going up to 13+ the alternator is working . Your best bet take it to a qualified repair shop and have it check .

Jan 27, 2017 | 1996 Cadillac Eldorado

1 Answer

1998nissan sendra doesn't charge but the battery light goes off when i start the engine when I remove bartery terminal engine stop running


A 98 still has a computer so with out power it will die my guess is corroded wires first use a multi meter and check for voltage on the terminal on the alternater it should show 13 to 14.5 volts D/C then check the battery see if it has 13 to 14 volts if yes it is charging if the altenater show 13 to 14 it is charging if the voltage is 11 to 12 or lower it is just reading the battery and you need a alternater if the aliternater is good and the battery is not charging it is either the power wire or ground you can use jumper cables to check jump from the post on the alternater to positive battery by its self if this fixes it it is the power wire if not unhook the positive and then connect the ground thermal to the engine block and see if that fixes it if not do both you will see the problem good luck

Nov 06, 2016 | Cars & Trucks

1 Answer

Voltage flexuates from14volts to 11volts when 2003 tahoe is in drive and brake is apply at stop sign and also when idling


Check that the idle speed is not too low in drive . Should be around 900 rpm in neutral and the idle speed is adjuste in drive to no less than 750 rpm. IT takes rpm for the alternator to charge the battery so if you have 11 volts then the car is runnung off the battery and not the alternator. It needs 13.5 volts to charge a battery and most regultors are set at 14 vvolt to 15.5 volts. If the vehicle is runnung from the battery as I stated then items like blinkers and stop light operation will show as fluctuations on the gauge. Have the system check . Make sure the drive belt to the aklternator is correctly adjusted as a slipping belt will also cause a problem.

Feb 06, 2013 | Cars & Trucks

2 Answers

Battery light on


You probably broke a belt that powers the steering and alternator, you didn't post the car type or year but that's where I wouls start looking

Nov 15, 2011 | Cars & Trucks

1 Answer

I have a2001 Saturn SL and the battery light came on,Ireplaced the battery and had the Alternater checked but the battery light stays on. Advance Auto Parts said the alternater is not chargeing


Battery light usually means the alternator is not charging, get yourself a multimeter, select Volts, put red probe on positive and black probe on negative while the car is running, it should read above 13 Volts, not higher than high 14s, if it reads 12 volts or lower while engine is running than your charging system, alternator mainly, needs attention, any decent mechanic can check this in 2 minutes.

Jun 16, 2011 | Saturn LS Cars & Trucks

1 Answer

Voltage at battery at idle is 11.9 and at2000rpm it isover 14 volts.lights brighten and heater fan motor speed picks up considerably as rpms pick up from idle to 2000 rpm and on up.load tested battery and...


Did you check the voltage after a drive or after it was jumped. The battery may need some time to recharge if it was jumped before it gets checked. Have you checked for a possible draw on the battery? This could be a reason it dies every once in a while. I think that the Alternater is on its way out, it doesn't sound like it is charging like it should. It the new belt tight enough(some new belts stretch after a short time)

Jan 27, 2011 | 1998 Suzuki Sidekick

1 Answer

My2002 cavalier stopped on me i was riding and all my lights on the dash was blinking on and off ,then the lights on the dash started dimming, my radio quit working, then where the speed domerder is it was...


check your battery if volts are less than 13 charge battery. car will probably start .than check battery voltage againwith car running if it is not 14 volts or better you have a bad alternater .I suspect your alternater is bad.

Dec 02, 2010 | 2002 Chevrolet Cavalier Coupe

2 Answers

I HAVE A 1995 CADILLAC ELDORADO AND NEW BATTERY WONT CHARGE


altenators have to be running a 13.5 volt charge to be good

Mar 12, 2010 | Cadillac Eldorado Cars & Trucks

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