Question about 1996 Isuzu Rodeo

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I HAVE REPLACED THE ALT AND THE BATTERY AND IT STILL WILL NOT KEEP A CHARGE HOW DO I CHECK THE CHARGING SYSTEM?

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You will need a voltmeter, with engine running, check voltage at battery, that will be alternator out put voltage, should have no less then 13.0 volt's, if less bad alternator, if good voltage, disconnect battery neg. terminal and hook test light to battery neg. terminal and to neg. cable, if test light turn's on, you have a battery draw, make sure every thing is off for this test, if light is on start pulling one fuse at a time till light goes off, that's the circuit you need to start checking, hope this was very helpful.

Posted on Jul 05, 2010

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I think u hook a volt meter to the battery cables

Posted on Jul 05, 2010

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There is 4 gauge black/red wire going from te alternator to Fuse #2 in the PDC. The alternator and battery both connect (positive side) at this point. The alternator's path to charge the battery is from the alternator, to this tie point, then to the battery. In the wire, between the alternator and the PDC tie point, is a fusible link. This link may have broken or melted. That would keep the alternator from being able to charge the battery. I would check this wire for continuity and replace the link if necessary.

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I REPLACED THE ALTERNATOR IN MY 2001 MITSUBISHI MIRAGE AND THE BATTERY BUT IT STILL WONT CHARGE ,THE NEW ALT. WAS CHECKED AND IS GOOD. ALSO ALL FUSES ARE GOOD. AM I MISSING SOMETHING?


You need to check the charging circuit which is most important to the automatic charging of the battery to keep it in brim condition. Hence the alternator current will feed into the charging regulator which determines how much the battery needs to be charged . check this unit by tracing the alternator wiring and use a ammeter to check the battery charge current. get help if you are not equipped.

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When i turn the lights on the car shuts off. 74 cadalina


This sounds like a low battery voltage problem, and the cause of this is a inadequate charging system. There is enough battery to initially start the vehicle and possibly keep it running for sometime. But, when you turn on your lights the headlights need alot of power and if the battery doesn't have it and the alternator doesn't offset the load, everything comes to a stop. Have the charging voltage checked at the battery terminals. You should get a reading within the range of 23.6 to 24.2 volts. The lower the voltage the higgher the charge amps and the higher the voltage the lower the charge amps. If the charging is at 13v or lower your alternater is charging at or near its output capacity and indicates the battery is going bad. On the other hand if it iis charging above 14.2, the alt. is not charging or too little outpuut and should be or needs to be replaced. It is important to have clean battery connections.
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Below 13,6 = bad battery
A bad battery will causr the alt. to overheat and fail
A bad alt will cause the battery to boil and overheat damage will result
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