Question about 2000 Mazda 626

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I WANT TO KNOW IF mazda 626/ 2000 GF modle ALTERNATOR IS RUN BY ECM AS IAM CURRENTLY FACING BATTERY LIGHT ISSUES. ITS NOT CHARGING DESPITE REPAIRED

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Talk with an accredited auto electrician as to whether the alternator is internally or externally regulated
problems may be not rectifying the charge, diode failure , bad wiring and connections , fuse

Posted on Dec 14, 2016

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How do I know if its the battery or the alternator with my 2002 Lincoln LS v8 if give me a check charging system for error and a red bartery indicator light is lit up on the dash


Use a multimeter to check the current (voltage and amps) being generated by the alternator with the engine running (at different rpm's). Also, after fully charging the battery with an external charger, check the current and see if the car starts fine without issues.
This could be the alternator grounding and draining energy.
This could also be a EPM module if there is one present.
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Is this an ECM problem?


No, not the ECM. Replace the alternator. The ECM fields/grounds the alternator to work. The ECM monitors the voltage and sets the light if voltage is to low or to high. Since it puts out 16+ volts the ECM is still working. The regulator in the alternator is bad.

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amps reading on the truck amp meter is the current that is being generated to run everything as well as charge a battery that will be at best around 80% charged.bench testing an alternator gives these readings as the regulator is feeding into fully charged batteries with no draw on the system. When batteries are 100% charged the charge rate will be as low as 2 amps but in a car where there is a current draw for the ECM , ignition , fuel pump and what ever the alternator feeds these first before it charges a battery. You used a amp meter to get a voltage reading which is reading the voltage drop across the current draw. If you had used a voltmeter (multimeter) then you would see a voltage increase with the rpm increase. The

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2006 Impala Battery drains while car is running. Battery has been tested, alternator has been replaced. Connections to battery, alternator, aux power have been checked. Happens intermittently, sometimes...


drive belt tension
have the voltage regulator checked /replaced
if it is faulty the battery will drain as it is running all of the electronics without help from a alternator
AS the ecm draws a lot of current, a battery not charging will not last long
most modern cars run about 85% of the alternator with the rest for charging the battery
if the voltage regulator is part of the ECM, replace the ecm unit

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1994 gmc sonoma with alternator putting out 11.7 volts no matter what you have on. New battery and rebuilt alternator. What else could cause this low voltage situation. The battery and abs lights are on.


Try checking the gauge inside the truck
If it reads wrong - not to worry - just carry on as it is.

Try turning everything on - then CAREFULLY remove the NEGATIVE battery cable - if the truck continues to run WELL - the problem is most likely the gauge.

Check it the local battery store - free.

Gary @ Fix Ya.

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98 mazda 323f. my car keeps losing power (lights dimming, radio turning off etc...) and the only warning light i get is the airbag warning. does anyone know what could be causing this.? i turn off my...


this sounds like the alternator is only making enough current for daytime running and so the battery is barely charged. so when you use lights and accessories its draining it further. this could indicate a lose fan belt,(try the simple things first) or perhaps the regulator in the alternator, or maybe a dead cell in the battery

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Charge light going out but not charging battery.


what is the voltage of the battery when running, voltage when turned off, voltage after headlights are on for 10 minutes. is the battery good? how do you know. these take a sealed gell cell battery.

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1 Answer

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I'm guessing that you've tested the actual current output of the alternator then. I'm assuming that the output is between 13-14Volts at the battery when the car is running... If it's too low, then it's not charging your battery at all, too high, and it's frying your battery.... Another thing that can cause this is if you have a short in your electrical system.. that, however, will be difficult to narrow down...

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check for a big heavy fuse nearf the battery,i dont know if it has one?? iam a general mechanic not a mazada specialist,try this trick ? start engine and hold rpm at 1500,then disconnect battery and see if engine stops if it carries on running then altenator is working.If it carries on running then turn on all electrical thingys except the radio.If its still running ok then fault is elsewhere like a discharge overnight.

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Charge light flashes and becomes solid when my mazda 626 idles


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