Question about Mazda 626

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My battery is not charged and when the car is idle the battery comes close to dying and shutting off the car so i believe it is the alternator that is the problem i have jump started my car as well as change the battery but it seems to only be a temporary fix i would like to know how to replace the alternator myself if possible

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To check if the alternator is out of services just start the car and take off the negative terminal if the engine stop replace the alternator maybe you can do be your self check firt the accesibility.

Posted on Oct 23, 2010

  • Anonymous Oct 23, 2010

    take off the negatrive terminal when the car is running if the engine stop replace the alternator. Can be ease to replace if it is accesible

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Truck starts with a boost but once cables are off battery indicator drops then truck shuts down unless engine is revved.


Check the alternator and the charging system. You may have a weak or failing alternator. If you have a voltmeter, get the battery reading with the engine off. A charged, good battery should show at least 12.6 volts. If you have to boost it, it must be low on charge. Recharge it or have it tested, a dead cell in the battery would not let it charge up.
Now take a reading on the battery with the engine idling, or idling as low as possible without dying. A good alternator and charging system will make the battery now read at least 13.5 volts. If your reading is lower than this, you probably have a weak alternator.

Mar 24, 2015 | 1994 Chevrolet Suburban

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Today my battery light in the dash come on and for a Little bit when u idle the engine up the light would go off but when idle dwn it come back on i cleaned the batterg terminals ck the water in battery...


You've got a bad alternator. At idle it was not charging but at higher speeds it was still able to charge some. It blew a diode.
Your battery died because it was not being charged.
You should have 12.5 volts on a charged battery with the engine not running. It should not drop below maybe 10volts when cranking and should read around 14volts when running if your alternator is working.

Sep 22, 2017 | Cars & Trucks

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Battery won't stay charged alternator is good. so what could be the cause?


check alternator wires for damage.your drive belt could be slipping.replace battery cables.check alternator fuse.code scan for pcm fault since it pcm controlled.

Oct 26, 2012 | 2006 Chevrolet Aveo LT

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Upon startup engine idles rough then speeds up and returns to normal idle .After a couple of minutes the volt light comes on then no power then a complete shut down.Starts back up for a while then shuts...


OK, the volt light means that the alternator is not charging the battery. It could mean the battery is shorted out, or the battery is bad or low on charge due to an alternator not charging.

Replace the Alternator and battery as indicated by standard voltage output tests under load.

The computer in the car will not operate the engine properly on low voltage.

Fixing the charging system, may resolve the rough idle (meaning that it may be trying to relearn after data was erased by low voltage of the battery), and the speed up.


Try the charging system first, and once that is repaired, reevaluate the engine driveability and speed and idle smoothness, after it relearns.

Good luck on this repair.

Nov 06, 2010 | 1999 Buick LeSabre

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When the car is jumped it runs with the cables on all gauge everything works fine once you take the cables off the car idles fine untill you press the gas, then dies out<<


The alternator is not generating enough current to the coil to maintain the spark. This could be a bad coil or a bad alternator or BOTH. When you are connected with cables the extra voltage required as you accellerate the gas pedal is pulled from the DONOR car battery and motor. When running at idle your car DISCONNECTED there is not much demand for power. As you press on the gas the RPM increases requiring more spark than you car can produce and it cant recover... trying to keep up drains what charge there is from being jumped off and the car dies. The fact that it dies leads me to believe the alternator should be your first troubleshooting area... You can test this with a multimeter. You should get 14+ volts coming out of the back of the alternator. The car requires 12 volts to run the engine and the extra volts are put back into the battery as a charge...less than 12 volts is a sign of a bad alternator and can cause your problem.

Jun 05, 2010 | 1994 Mazda MX-3

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Something is draining the battery on my 2000 Jeep Wrangler. We have a new battery, alternator checked okay, new starter. The jeep starts, lights come on, and then will die while driving. What could be...


Put a volt meter across the battery terminals while the vehicle is running. You should read no less than 12.5 volts at idle with no accessories running and no less than that with accessories all on. Normal volts should be around 13.5. Aside from slight fluctuations, the voltage reading should not steadily drop, regardless of how long it is running. I doubt if you have a system drain if it's shutting down while driving...the alternator would compensate for that. Some charging systems incorporate the voltage regulator into the computer. If the alternator checked good by itself but the tests I recommended show otherwise, likely your problem is with the computer.
If the engine does not need to be jump started after it shuts off, you may be looking entirely in the wrong place...but you didn't mention that part!!

Oct 21, 2009 | 2000 Jeep Wrangler

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My Jetta is not a TDI....My car is dying when I come to a stop. It will start right back up. It also shows the battery warning light. Would this be the battery or alternator?


It is possible.

When at idle the RPMs drop as the engine slows. This results in the alternator slowing. If it is failing or you have a problem with the charging system it can cause the car to die.

Usually however with a charge failure it will not start back again easily.

Try checking under full load. Run all electrical systems radio, heater, lights etc at idle. If you see the lights start to fade and the engine dies it is likely the charging system.

Most likely the alternator or part of the regulating system.

You can have the alternator tested or you can do it yourself.

Connect at voltage tester to the terminals on the alternator. Run the engine and measure the output. It should read as per the indications on the alternator. There is a sticker on the alternator telling you the output.


Start there.

Hope this helped. Please rate if this helps you.

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3 Answers

Not charging


Your alternator is faulty.

Aug 20, 2009 | 1997 Dodge Intrepid

1 Answer

Engine dies while idlinf.


Check alternator output should be above 13.5 volts,charge battery fully then use a multimeter to check battery voltage...then start car and check voltage when running...should be higher reading running then when car is shut off...if not alternator maybe bad or wire not on right? Best of luck to you!!!!!

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1 Answer

When I'm idling in an Atlanta traffic jam yesterday the battery gauge gets very low, the radio turns off and I'm afraid battery is dying. Coming out of the traffic jam and returning to highway speed the...


It sounds as if the alternator is not putting out enough charge at idle to keep the car's battery at minimum necessary voltage levels. When you drive, the RPM are higher and the alternator spins fast enough to charge the battery. At idle speed, the output from the alternator isn't enough to replenish the battery's charge. Find out whether you have a separate voltage regulator, or if it's built into the alternator (they often are). I think you're looking at a new alternator though. You could go to an auto parts chain store and have a charging system test done to see if everything is OK - at AutoZone or Advance Auto Parts, they'll do it for free - it'd be worth the time to have them do that, to see whether it's the battery or alternator, or neither.

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