Question about 1993 Mazda 626

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Charge light, abs light, and rear light. Mazda 626 1993 2.5L

I have mazda 626 1993 2.5L, driving to work. Three lights on the dash came on all at once (abs, charge, rear). Alternater is running full on with the charge light on, when ran for a few min the alternator starts to over heat and smoke. non of the rear lights are out, all work fine. and abs system is fine. The lights only come on when i get the rpms over 1000. when running under a 1000 all the lights stay off. Any ideas?

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  • heavenly_kev Jul 22, 2009

    regulater in the alternater toasted it self. was producing 26+ volts and didn't turn off. just replace alternater now. pain in the ass to get out. have to remove the rad. and didn't know that the bottom bolt in the alternater slides out at a certain angle so almost had the engine pulled out of the car. hope no one has to do that. pain in the ass it is

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  • Mazda Master
  • 2,359 Answers

It can be as simple as the funny belt tensioner on the alternator!

I hope you got a simple volt meter to check the voltage.


12.8-13.6V is a health battery.

Get someone to help you to put tension on alt. belt.

If it does not look good then change it.

Double check all belts.

The should not give over 1/2" I like to keep them 1/3" of less.

Tighten all connections.

Pull spark plug cap one at at time to check for corrosion.

The coil can cause a lot of problem.

Spend time to grounding and secure all coil boot.


Good luck

Posted on Jul 15, 2009

  • Vincent_G
    Vincent_G Jul 22, 2009

    I'm glad you are able to identify the bad regulator before it start frying your computer and audio system.

    I just wonder did the battery got toast? 26V is a lot.



    You should check the fluid level of the battery and top it off with acid.


    I would hose down the battery tray and the surrounding area......just in case acid spill over it.






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