Question about 1987 Toyota Supra

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When i start the car the volt meter drops down to about 9 and then goes up to 12 but never goes over 12 even with a new battery. if i turn my lights on it drops slightly or anything that uses more power blinkers back up lights etc... i replaced the battery, alternator and starter now and i still does it and the battery will die after driving it awhile.

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Question is which brand of car you own.It is important to resolve your problem.Thank you.

Posted on Oct 04, 2017

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Posted on Jan 02, 2017

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SOURCE: 2004 TOYOTA COROLLA - HARD START

check all eath wiers in the engine bay it sonds ilke a undervolt to me

Posted on Oct 06, 2008

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SOURCE: Volts drop off while driving and then go back up

Chk. all your connections to the battery make sure there clean and tight, and also to the starter, and all other ground connections like from frame to engine to body. I know you said auto zone chk. it and said it was ok but it still sounds like the internal regulator is kicking in and out to me, but a loose connection could cause that to.if you chk. everything i sugested, and find no problem, find a shop that specializes in alt. rebuilding and have them chk. it they know a little more than auto zone does, its there business.

Posted on Apr 14, 2009

  • 143 Answers

SOURCE: 12 volt alternator putting 24 to 48 vols

Try another multi-meter or change the settings... 12V alternators cannot produce 48V.

Posted on Jul 02, 2009

  • 1071 Answers

SOURCE: wiring an amp meter diagram

put the meter in series remove wire gointo back of alternator put one lead on wire and one on alternator that should give you your reading

Posted on Jul 23, 2009

  • 7 Answers

SOURCE: i just replaced alternator and battery, my volt

voltage regulator replace it

Posted on Dec 06, 2009

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2000 chevy silverado. alternator problems. start truck and meter shows about 11 to 12 amps for a few minutes then goes up over 14. Did this for several days. today started and went right to 14 amps then...


amps or volts
11 to 12 amps indicates nothing but if it is volts then it indicates that the alternator is not charging the battery
Battery voltage is 12 -13.5 volts and when charging is 14.5-14.8 volts dc
the rest of your statement indicates that the alternator or voltage regulator is faulty and you should have the charging system checked by an accredited auto electrician

Feb 26, 2018 | Cars & Trucks

Tip

12 volt battery test


I have seen many times a 12 volt car battery pass the diagnostic test performed at a repair shop but still fail while being used in the car.
A simple test to do at home is the cranking amps test. Place your 12 volt meter on the battery and check for 12 volts. Then looking at the meter crank the car over. If the voltage drops to 10 volts with all accessories off then the batteries cranking storage amps is weak. A bad scenerio would be the battery drops to below 9 volts. Below 9.6 volts there is not enough electricty to provide good spark to fire the engine.

on Aug 14, 2010 | Chevrolet C1500 Cars & Trucks

1 Answer

Why did my lights go down and battery volts drop?


First put your battery on a slow charge 6-8 hrs.then check the batteries voltage it should have at least 12-12.8 volts if it does'nt then you need a new battery.If has 12 volts after its charged and goes dead after its installed in the car then you need a new alternato.

Jan 27, 2012 | 1995 Cadillac Eldorado

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Where is the starter located on a 2007 Chevy Impala? It just clicks when I turn it on and lights barely turn on and the air will turn on only when trying to jump the battery. Engine didn't turn on even...


Check the battery like this:
Turn on the headlights, then try to start the car.
If the headlights do not dim or go out, then the battery is likely ok.
Check that the battery cable plus post, goes to the starter, Minus post to a good ground, like the engine.
If wiring is ok, then look at the starter solenoid for a good connection.
Problem is most likely the Solenoid or starting relay, whichever the car uses.
Hope this helps.

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Generator is good, new ignition, new battery. Car started up right away, drove 20min. Now won't start?


Tell us more details.
For example, how do you know the alternator really is good?
You say new "ignition", but that could be the ignition switch, plug wires, distributor, etc.
Regardless if the battery was new, you can easily drain the battery in less then 20 minutes, so we need to know if the battery still has a charge or not. Put a test light or volt meter across it.
We also need to know if it does nothing, not even drain the lights, or if it clicks at the solenoid?
The best would be if you put a voltmeter across the battery.
If the ignition switch is bad, then nothing at all with happen.
If the battery is bad, it will start around 12 volts, but drop down below 9 and not come back up when you stop trying.
It is drops but comes back up, it is probably the starter.
But you could try turning the engine over by hand on the alternator nut, because it could be seizing up from a bad bearing.
Try jump starting it also.
If that helps, then check the voltage when reved up.
It if does not reach over 13.5 volts, the alternator is not working.

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87 toyota camry new battery wont keep charge, alternator checks okay, in dash bulb for charge and brake and lights stays illuminated?


Generally if charge light is on, alternator has a bad diode in it. This lets the charged battery lose its power by flowing in the reverse direction. It sounds as the alt., is either not connected right or is swtill bad

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1 Answer

On 1973 Ford LTD the battery runs down while


dear friend-the voltage that you are measuring is battery voltage and as soon as you try to start the vehicle it will drop to 9 volt which is not enought to start.if you remove the pos,battery clamp and put a test light between the pole and the terminal and and the light lites up then there is a draw running the battery flat.

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sounds like a defective starter drive.

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1 Answer

1999 Buick Regal starting problems


Connect a volt meter to the neg. and pos. of the battery. Have an assistant start your car and watch to see how far the voltage drops. If it drops more than 2 volts, for example, hook up the meter, you should see 12 volts. By starting the car and it drops below 10 volts during start up, your starter is slowly going out. It taking more amperage to start it than normal.

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