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Old 07-08-2018, 07:55 PM   #1
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Alternator high voltage

Hello all, with your guys' help I just competed my first ever rv trip and it was great. I loved it.

I did notice on the way back that the voltage gage on the alternator was extremely high. The needle was right on that line between normal and the red high line, and barely crossed over a few times. I didn't have a meter to check it, but I did think to start the generator and as I suspected it wouldn't run with the engine running, presumably because of the overcharge issue.

I should also note that it started off normal and I didn't notice if it crept up or switched suddenly.

In all my experience I've never seen an alternator with too high voltage, does anyone know what causes this?
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Old 07-08-2018, 08:13 PM   #2
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I had an engine alternator that went higher voltage and itís related to the internal voltage regulator. In my case voltage started to go close to 15 to 15.2V. I have a digital readout. And confined by voltage meter while idling.

Solved by rebuilding the alternator with new voltage regulator. While itís out new bearings and bushings as well.

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Old 07-08-2018, 08:14 PM   #3
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1. Are you speaking of the alternator in your vehicle?

2. If so, what year, make, model?

3. Not quite sure about your mention of the generator. Can you amplify your statement:
but I did think to start the generator and as I suspected it wouldn't run with the engine running,
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Old 07-08-2018, 08:22 PM   #4
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Quote:
Originally Posted by MongoBadger View Post
Hello all, with your guys' help I just competed my first ever rv trip and it was great. I loved it.

I did notice on the way back that the voltage gage on the alternator was extremely high. The needle was right on that line between normal and the red high line, and barely crossed over a few times. I didn't have a meter to check it, but I did think to start the generator and as I suspected it wouldn't run with the engine running, presumably because of the overcharge issue.

I should also note that it started off normal and I didn't notice if it crept up or switched suddenly.

In all my experience I've never seen an alternator with too high voltage, does anyone know what causes this?
Mongo,
Alternators have what's called "Voltage regulators". Those regulators do, just what the name implies. They REGULATE voltage. Now, some are what's called INTERNAL and some are EXTERNAL. That is, some regulators are actually attached to the outside of the alternators and, some built inside the alternator. But, based on what you're stating, it sure sounds as if your voltage regulator may have gone to lunch or, is on its way to. Unfortunately, the only way to really tell is to take the alternator off and run it over to any facility that has capability of bench testing it.

Now, some Autozones, Oreillys and a few other basic auto parts stores can test some but, I don't know if they have the ability to test larger ones. Never done it. So, this is about all I can tell you on this. Good luck and, if and when you find out for sure, let us all know will ya.
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Old 07-08-2018, 09:46 PM   #5
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Thanks so much, I'll get it checked out.

Blue pill, what I meant was I started the generator to see if it would kick off because both it and the alternator charge the batteries. My theory was if the alternator was borderline to high them there would be some safety mechanism that would keep the generator from running or charging the batteries. If it kept running, I was going to look at my panel and see if it was charging or not. Before this happened, the generator and engine would run at the same time just fine.

Also, the vehicle is a 1998 national tradewinds 7370. The engine is a c7 though and I don't know what year it is, it originally came with the 3136.
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