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Old 09-15-2012, 09:50 AM   #15
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replaced the alternator now all is well ....

2008 Holiday Rambler Vacationer 340 Cummins
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Old 09-16-2012, 08:26 AM   #16
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Thanks for following up with the resolution to your problem, replacing the alternator.

I suspect that the OP had to do the same but we never heard back about his particular situation and unfortunately in a lot of cases you never do.

It's always nice to know what the resolution was especially for the people that research problems and read through a thread but never see what the solution was for the problem that possibly could help them.

Thanks again and I am glad you solved your problem.

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Old 09-17-2012, 07:20 AM   #17
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Your very welcome and yes your right alot of threads leave us hanging.
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Old 11-04-2015, 04:41 PM   #18
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alternator putting out TOO much Voltage HELP

Cummins Shop has installed 2 New 14 volt alternators both show 24 volts?

Anyone out there have any ideas what is going on? The New alternator is the exact make & model brand (200 amp/ 14 volt )of the one removed.

We are dead in the water in NM even the Cummins mechanic's can not trouble shoot.

Please Help!
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Old 11-04-2015, 11:09 PM   #19
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Not knowing how old your RV is kind of makes any 'guesstimation' difficult but I'll take a crack at it.

There's what's known as Field voltage (the F terminal on the alternator) that is controlled by wiring and circuitry sometimes going all the way up to the dash, then back to the chassis battery. Sometimes it's routed through an ammeter on the dash which tells you the charging status. If this voltage is low, it causes a higher voltage out of the alternator. This self regulating circuitry charges the starting battery quickly, then tapers off.

That wiring has a diode in series with the F terminal. If that diode is not doing it's job, you can get a higher voltage out of the alternator because the system is reading wrong and calling for higher voltage at the battery.

You can have other issues, like a corroded terminal or a poorly crimped wire. But my money would be on a bad diode. Usually these are located very close to the alternator, within a couple inches. They're inline, so covered with shrink tubing or vinyl tape. Checking all the terminals is important too.

Finally, you'd get more responses if you let us know the year of your RV and started your own thread rather then tack onto a thread from 2012.

Good luck.

PS I would not trust a Cummins shop that was measuring 24 Volt out of the alternator and just replaced it twice. They don't seem to know what they're doing.

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alternator, charging

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