Kohler Generator runs indefinitely on "RUN" but stalls from Cabin if set to Auto?


NH-PC

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Kohler Generator runs indefinitely on "RUN" but stalls from Cabin if set to Auto?

This is on a 37PC I just bought. 450 hours on the boat and the generator has a weird issue with stalling out right away while using it on Auto. I changed the fuses, did a service, impellor, cleaned some connections, it will RUN, and charges the house batteries, but ONLY if manually started from the RUN position at the generator.

If I use the AUTO button, and then using the start button at the cabin panel, it will start and then it shuts off less than 5 seconds later? When I manually run it it will run seemingly forever, underway, at port, etc. without any errors. When it shuts off from the panel/cabin I get either 1) no error code (50% of the time) or 2) EC62 (50% of the time). I have already changed the fresh water intake impeller. It did run hot on me once and gave me an overheat error, and the anti-freeze tank filled and spilled over a little, so maybe I trashed the impellor that one time? Not sure why it overheathed that one time or if this is the issue. I have another impellor for this weekend just the same, 2 actually to have one around. But this may not be it? When it runs on manual there is tons of water coming out and it's warm like a bath, not cool, not scolding? Maybe I check the impeller again but it's odd that I would get an error on cockpit starting but NOT on manual? Are these things designed to not show errors when manually started? That seems dangerous. I can't find this info anywhere.
thanks all,
 
Further on this, I change the impeller again and though only one blade was a little bit twisted that did the trick

The generator now starts from the cabin and stays running. It?s a bit concerning that if you run the generator from the run button it bypasses some error codes. I wouldn?t think it would work that way. Apparently the one time it overheated that was due to something with the impeller and water pick up and that was enough to stop it from firing up from the cockpit
 
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