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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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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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.
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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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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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Hello! If you have a voltmeter, set it to read 12 volts...With engine off read across the battery terminals...Record the reading...Start the engine...Take the same reading...Voltage must be at least 1.8 volts higher...If not, The alternator isn't providing a charge...Next, turn off engine...Set meter to its lowest scale...Connect + probe to + battery post...Connect - probe to the + (Black/Gray or Black wire) battery lead on the alternator...Start the engine...Turn on heater fan and headlights...Meter must read less then .03 volts...Move the + meter probe to the - battery post...The - probe to bare metal on the engine block...Must read less then .06 volts...If either reading is above the given limits the problem is resistive/corroded battery cables which are dropping voltage...Remove and replace cables... Clean battery post and make sure the other ends are on bare metal...Guru...Saailer

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