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Old 03-09-2015, 02:30 PM   #1
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97 HR Imperial burning up alernators

Cummins 325 burning up alternators about every 20,000 miles. Any ideas? Thanks!!

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Old 03-09-2015, 02:41 PM   #2
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Are they new or rebuilt?
What shape are your batteries in? Have you ever load tested the batteries. Maybe overcharging due to faulty batteries OR bad connections both Positive and Negative.

Dennis & Carol
Said so long to our DSDP. Coming Soon, 2019 Unity LTV CB - 2013 Honda CRV, BlueOx Baseplate, Aventa Bar & Patriot Brake. And the 04 Bird
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Old 03-09-2015, 03:13 PM   #3
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The alternator is rebuilt. Batteries are about 6 months old, I will check the connections.The dash meter for the alternator shows it charging at close to 15 amps all the time. Seems hi to me. This is the 3rd one burned up in 7 years. Thanks
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Old 03-09-2015, 05:17 PM   #4
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You probably mean volt meter, showing 15 volts.

Dash gauges are notoriously inaccurate, so a check with a digital volt meter, may give you a better idea of charging volts.

If it is charging at 15 volts, you will need to check the wiring that supplies voltage to the alternator regulator. ( one of the small wires )

If it is charging between 13 and 14 volts, all is good.

2 years on a rebuilt could be expected. Next time, if you haven't, get a genuine Cummins reman alternator.

Good luck
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Old 03-09-2015, 05:39 PM   #5
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Thanks Dennis45 and Twinboat I will check on your ideas. It is a re-man of the original alternator leece nevell.
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Old 03-09-2015, 06:40 PM   #6
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If your rig is set up to charge A toad and house batteries etc. then it may be working the alternator to death as well. You may need to go to a larger alternator if that is the case.
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Old 03-10-2015, 09:46 AM   #7
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We are not charging the toad but good idea. Checked the positive and negative connections they seem to be fine. Will check the small wires at the alternator next. Any thoughts about the BIRD being a problem? Thanks keymastr for the input!
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Old 03-10-2015, 09:51 AM   #8
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Check charging voltage at alternator and each battery.

If a diode based isolator voltage is adjusted higher to compensate.

Is relay type it is not.

If alternator adjusted for diode type and you have relay type then overcharging and strain on system components such as alternator.

So check voltages and confirm system configuration.

Tony & Lori
1989 Country Coach Savannah SE
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