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Old 12-05-2005, 07:24 PM
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Mazda mx-6 alternator not charging

I have a question about my girlfriends mazda mx-6. Basically the car died the other way on her way home from work. All signs of bad alternator, even when checked with meter. My dad rebuilds alternators, starters, etc for koi. Anyway he did not have the plug to test that alternator, but his paper work said that if it is hooked up and tested w/out the plug and it DOES put out voltage, then the alternator is actually bad. This is because the alternator voltage is controlled by the computer not a regulator. We then installed a new alternator to see. Well, still no charge from it, battery voltage stays the same. The plug from the harness is also showing voltage all the time on the one prong and when started on the other prong, so the plug is good. The wiring diagram shows the leads fro mthe plug going striaght to the computer.
But if we have the proper voltage at the plug then isn't the computer doing it's job? Anyone know what in the world is going on? What could be causing the alternator not to charge? On my nova this happened but was the regulator and hers doesn't have one.

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Old 12-06-2005, 04:54 AM
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Originally Posted by 1quiknova
I have a question about my girlfriends mazda mx-6. Basically the car died the other way on her way home from work. All signs of bad alternator, even when checked with meter. My dad rebuilds alternators, starters, etc for koi. Anyway he did not have the plug to test that alternator, but his paper work said that if it is hooked up and tested w/out the plug and it DOES put out voltage, then the alternator is actually bad. This is because the alternator voltage is controlled by the computer not a regulator. We then installed a new alternator to see. Well, still no charge from it, battery voltage stays the same. The plug from the harness is also showing voltage all the time on the one prong and when started on the other prong, so the plug is good. The wiring diagram shows the leads fro mthe plug going striaght to the computer.
But if we have the proper voltage at the plug then isn't the computer doing it's job? Anyone know what in the world is going on? What could be causing the alternator not to charge? On my nova this happened but was the regulator and hers doesn't have one.
Doc here,

What year is this Mazda?

Take it to a local autoparts store and have it tested since your Dad doesn't have the proper test jig...

Other offenders can be a blown fuse link on the line to the starter solenoid, or real bad grounds...


Clean and tighten the Battery cables...

Charge the Battery up at 10 amps for 6 to 10 hours...If it was dead, don't expect the alternator to bring it back up..They just weren't designed to do that..Altenators job in life is To support the system, while replenishing surface charges lost in crank and high energy drains..not from dead...Chances are if it is dead, you may not have enough power to excite the alternator..

Have the battery load tested while you are having the alternator tested..

Doc
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Old 12-06-2005, 08:26 AM
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I had the alternator tested at autozone before he took it to work, he doesn't exactly trust them that's why. But he said it's jsut such a odd alternator and they also deal mostly with heavy duty stuff. But we know the alternator is good an that's not the problem. The battery is also good, he tested it and slowly charged it all day. I'll go to all the wires now.
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Old 12-06-2005, 08:27 AM
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oh yea, it's a 93. It runs fine and she even drove it home, like a mile last night with jsut the battery but no charging.
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Old 12-06-2005, 08:29 AM
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one more thing. After putting the new alternator on and no luck i put the old one back on and afterwards the alternator WAS charging. I shut it on and off a few times and kept checking, still was charging. Then I drove it around the block, came back and shut it off and restarted. Then it was not charging.
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Old 12-06-2005, 05:23 PM
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Quote:
Originally Posted by 1quiknova
one more thing. After putting the new alternator on and no luck i put the old one back on and afterwards the alternator WAS charging. I shut it on and off a few times and kept checking, still was charging. Then I drove it around the block, came back and shut it off and restarted. Then it was not charging.

Doc here,

Sounds to me like you have some real bad grounding issues here...

Set up your ground buss in this manner:

Run a properly gauged Ground cable from the battery to any handy bolt at or near the starter, From that same bolt get a Battery cable at the parts store, that has two 3/8 ring terminals on each end and attach it there and to the Frame.

Next get some 10 gauge wire and ring terminals and run that from your bolt on the block to the Firewall, and another to the Alternator bracket or mount bolt.

Next get some Wire Braid, (Radio Shack) and install braid from the radiator support to the frame, Fenderwells to frame , hood to firewall, Doors to door posts, gas flap to body, tailgate / Trunk to body.

At each point the wire is grounded, Burnish ALL the paint and grease off to bare metal. Use a proper star-washer and lock. Use sheetmetal or Tech screws where no screws are available.

It sounds like a lot of work, but after you assemble all the parts, it's only a few hours to do..and you'll end up with a system that will work reliably for many years to come..and can eliminate that from your troubleshooting list.

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Old 12-06-2005, 10:49 PM
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Read the voltage with the car sitting, idling, then revving. Record and let me know the results.
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