Question about 1989 Mazda 323

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Alternator isn't charging the battery, the battery is good and holds a charge the alternator tests out good too. ground wires are grounded, fuses seem good. Running out of ideas to look for here.

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Taking in all you said here, The alternator is bad. The alternator should be tested when is hot. 95% of the time-- when an alternator is checked cold, it wiil pass as good. CHANGE your alt. it will take care of your problem.

Posted on Feb 01, 2011

  • mariedukes4u Mar 12, 2011

    i had the same problem but it was one of the belts, not the alternator. the alternator 'belt'

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2004 ford freestar 4.2l Not charging, new alternator tested and working new battery.


Hotrod, Recheck,clean and tighten all connections. If you say you had new alternator tested and is working OK, the new battery must be defective. With the van running, use a DVO meter and check the battery, if it shows above 14 volts then the alternator is OK, a good battery should show 12.4, that leaves either a faulty battery not holding a charge or you have a parasitic draw(something draining battery). Which would have to be diagnosed by a good Tech.
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May 25, 2016 | Ford Cars & Trucks

1 Answer

Alternator cluster wire can it be grounded to get it to charge


You can't ground a power wire. If you have the schematics, look and see were the power comes from. Could be a fuse or from the ignition switch. If everything else works, I run a new wire, instead of opening up the harness to find the short.

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Already replaced new battery, new alternator, fuse, and pt connector - voltage sits at 12.9 running - system still not charging?


It isn't a good idea to disconnect the battery while it is running as the resulting voltage surge can damage electronics. Obviously if it isn't charging there won't be much of a surge...

Some alternators are mounted in rubber to cut noise and vibration. This type needs a ground wire which is sometimes forgotten during replacement and sometimes the ground wire just breaks.

A standard alternator only needs two or three wires and sometimes a ground wire. If the direct connection to the battery is good, the ignition light wire intact and working and if needed a battery sensing wire (though this wire isn't often needed in the last couple of decades) the alternator, if it is any good, will charge the battery at the regulated voltage of about 14.5.
If you are sure the alternator is a good one and it isn't charging the connecting wires must be at fault and need to be checked.

There is one other possibility and that applies only in the case of smart charging systems. If your car has a smart charging system the alternator will have several extra wires, usually plugged into the side of the machine.
The alternator works in a similar way to the standard unit except instruction from a separate control unit is capable of reducing or suspending charging. The smart charge black box talks with the engine management black box and charging is suspended during acceleration to cut fuel consumption or improve acceleration. A fault in the smart charge system can prevent the alternator charging.

Disconnecting the additional wiring will allow the alternator to perform its normal function without interruption. The ignition, charge or battery light is controlled by the black box and can do strange things that mean nothing when the smart charge is disconnected.

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2 Answers

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was the alternator bench tested? or tested on the car? if the alternator tests good off the car and the wiring has been tested, the ground may be loose or disconnected.

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1 Answer

Hooked up battery backwards on my 1992 ford explorer. Got it running now the alternator isn't charging the battery. Has 12 volts power. Could it be the points on alternator where the wiring hooks into...


The battery needs 12.6 volts or more to be in service
When the engine is running you need 14 volts or more
out of the alternator to charge the battery
You can test the alt by testing across the battery term
or the alt output wire & ground to case or motor
Could be the diodes got fried & you need a new alt
Have it tested at parts store, if you can't figure it out
Check all fuses & fusible links first

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96 cougar v8. new alternator, new battery. we worked on it all day at autozone. got a new battery and alternator. when we started it up and tested it it would go to 12.6v then fail. we tested the...


I had the same problem on my 96'. It ended up being the mega-fuse, which is located on the left side of the fuse box under a plastic cover that slides up. It has two wires running to it(one of which is the main wire from the alt to the battery), and two bolts holding it in. Hope this helps.

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1 Answer

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you need to check your grounds... very good possiblity there is a bad ground.

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2 Answers

Wont hold charge in expedition


  1. Check the wiring of the new radio installed as follows..
  2. Disconnect battery ground
  3. verify radio ground wire is grounded to metal
  4. verify radio hot wire (normally red and thick) is connected to a power source that is off when the ignition key is in the "off" position.
  5. verify that the always hot wire is connect to a constant 12v power supply even with the ignition off.
  6. make sure the pwr antenna wire if not used is taped at the tip and not touching any metal.
  7. verify that all speaker wires are connect correctly and not shorted to ground.
  8. connect battery ground you may get a small spark if your courtesy lites work.
  9. start engine verify your battery is charging by disconnecting the battery ground cable while the engine is running, it should continue running if it don't, alternator maybe bad.
  10. If it continues running problem solved..

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1 Answer

86 Tercel 2wd wagon won't charge it's battery


clean battery terminals ,bring battery to be tested after charging, after reinstalling battery run car and test alternator output it should be a minimum of 13-14volts if it is under 13 replace alternator , use a voltmeter set on 12 volt 10 amp dc to check the wire to check is located on the back of the alternator covered with a rubber grommet of course hold negative wirw on volt meter to ground and touch red wire to big terminal on back of alternator while car is running should have 14 volts or at least 13 volts

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