Question about 1995 Jeep Cherokee

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Won't charge. Alternator tests good. Voltmeter on dash reads 12.5v. Voltmeter across battery terminals reads 11.8v and dropping with engine running.

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  • Anonymous Mar 31, 2014

    I removed the alternator and it tested good for all 3 categories. Is there a relay or other component that could be defective.

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  • Jeep Master
  • 2,039 Answers

Check all fuses check power behind the alternator me i would put a wire from alternator to battery check what the charge hope it help fixya our post thanks pierre

Posted on Jul 09, 2008

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2002 mitsubishi eclipse alternator doesn't charge when cold replaced battery replaced alt had new alt tested checked grounds all good dose this paticular car have a alt relay?


No, cars do not have alternator relays. You say it doesn't charge but checks tested ok, and obviously that can't be true. Test it again. You put a voltmeter across the 2 batter terminals. With engine off, you should get 12.5 volts. While cranking, it should drop to 10 volts. When running, it should be over 14 volts. Cold or hot should make no difference at all, unless the belt slips or something? Why do you think it does not charge when cold? You have not told us everything.

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Easy way to check with a voltmeter. Check battery voltage on the battery terminals with key off, engine off, and then check voltage with engine running.
Engine off, a good battery should have voltage between 12.6 volts and 12.9 volts. With engine running, battery voltage should be a minimum of 13.5 volts, somewhere between 13.5 and 14.5 volts. This would indicate the alternator is good and is charging the battery. If voltage is less than 13.5 volts, if it only shows same volts as when not running, the alternator is not working right. Take it off and have tested for free at a parts store. It could be a bad alternator or it could be that the wiring between alternator and battery has a problem. If alternator tests good, start looking into the connections between alternator and battery.
Does your battery or alternator light stay on when engine is running? This would indicate a charging system problem. Time for the voltmeter test.

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1992 2500 battery drains


Have the charging system checked. Maybe the new alternator isn't charging. Is your battery light on when running? If you put a voltmeter across the battery terminals when engine is running, you will know if alternator is working or not. You first should have the battery charged up. Voltage should read at least 13.5 volts, engine idling. If you just get battery voltage, say 12.6 volts, alternator is not working:. Check all battery and alternator connections for a clean, tight connection. Battery cables and connections should be inspected. Check for any blown fuses, your truck may have fusible links- if any are bad, you need to replace them. They would be located close to the battery, as they serve as power distributors.
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