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Generators In this forum we will try to answer any of your questions about the different model generators that can be found on Blue Bird coach's.

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  #1  
Old 05-28-2019
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InfiLights InfiLights is offline
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Default Generator overvoltage help - 150V output...

Hi all,

Hope somebody can offer a suggestion and some help.
Down in Florida looking at this '88 PT40 and the generator has the problem with the shutdown as discussed before it the other thread...I think the lever needs to be loosened up on the injection pump...but I have another problem.....it puts out 154V on both legs and I am afraid it will burn up the roof ACs on the trip back if I don't do something about it....way too high....

Is there an adjustment of the voltage regulator that I can dial the voltage down to 115-120 V ?

Suggestions please ?
BTW, the generator keeps running at 150V+ and not shut down due to overvoltage....

Thank you
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Old 05-28-2019
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Turn the speed down.
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Old 05-28-2019
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How ?
Kohler, 12.5CCO65 diesel, yanmar engine.
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Old 05-28-2019
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Some regulators have an adjustment for voltage,i guess you just have to look and see if theres a small screw to turn.
I don't think theres a over voltage shutdown,if there is i'm not aware of it.
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Old 05-28-2019
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Can you please tell where to look for that screw?
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Old 05-28-2019
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Quote:
Originally Posted by Rick View Post
Turn the speed down.
There should be a couple of long screws that adjust against a "L" shaped bracket.
one screw will adjust the engine speed and the other screw will lock it in place,its all on the injector pump.
10MM wrench i think?
Lower the rpm until the voltage is 120.
Has the owner been "fixing " on it?
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Old 05-28-2019
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Will try that tomorrow morning. This may have a bearing on the **** down as well if it runs too high a rpm.... will get the fuel filter changed and run ATF/Seafoam in it to clean out the injection pump.
Right now on shore power so we have AC....83 F at 10.30 pm... tomorrow 100+....

Appreciate the advice .
Good night to you all. Will report with progress.
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Old 05-28-2019
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Im going to back up here. Your generator did not get out of adjustment from sitting. Don't start adjusting anything until you have run the engine for a couple hours. Turn the breakers off at the generator. Its gummed up from no use.
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  #9  
Old 05-29-2019
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On some generators frequency, 60 hz, is controlled by rpm, output voltage is controlled by a voltage regulator. There may be a small screw on the voltage regulator board that will control the output voltage.
I am not an expert on this generator, I guess my advice is do some research before adjusting anything.
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Old 05-29-2019
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Agreed.
Where is the voltage regulator board on a 12.5CCO65 Kohler?
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