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Old 09-30-2015, 08:06 PM   #1
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1995 35' Land Yacht Diesel
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Onan Genset and Moisture

Recent trip home in all day rain resulted in propane fueled Onan Marquis 6500 not starting at midway stopping point. It did run earlier in the day before I shut it down. Still does not start two days later. I suspect moisture in the genset somewhere and want to make sure this does not occur again (Happened once before about five years ago. After about four days sitting it started right up). First, what component is being affected by the moisture? Second, how would one wrap, shield, or cover the affected component to prevent water intrusion? We ended up canceling the overnight stop and drove the rest of the way with just the alternator keeping 12v going and batteries charged. I got cold pizza for supper!
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Old 10-01-2015, 10:41 AM   #2
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Onan genset and moisture

So, on the third day the genset turned right over and is purring like a kitten. Must find a way to shield from moisture intrusion. (or don't drive in the rain!)
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Old 10-01-2015, 02:22 PM   #3
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1974 20' Argosy 20
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That's an interesting problem. Exactly what are the symptoms?

Does the generator crank or turn over trying to start?

If it turns over then more than likely you're not getting any spark in which case you need to see what electrical components are getting wet.

Assuming it has an electric pump I would think even if just the pump was experiencing some sort of electrical connection problem it should still try to start once or twice before it ran out of fuel.

Brad
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Old 10-01-2015, 10:03 PM   #4
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Unit cranks just fine from all three locations (dash, panel and at the unit itself) and there is 3/4 tank of fuel. It just will not light off and run. Runs just fine now. So yes, I need to find out what is getting wet. Spark plugs look fine so I'm thinking maybe the control board or maybe even the carb.
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Old 10-01-2015, 10:33 PM   #5
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You have a diesel & your gen runs on gas? If so wet no start would most likely be ignition.
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Old 10-02-2015, 07:01 AM   #6
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Yeah, ignition is about the only thing it could be. Either your points (assuming it's not electric ignition) are getting wet or moisture is getting into the high tension wires at the coil. You might also check and clean all electrical connections in the ignition circuit.

I had an issue with my 2000 F250 in that the starter relay mounted on the firewall doesn't want to energize due to a poor ground when there is moisture in the air. I fixed the problem by running a separate ground wire from the battery to the relay housing. I know you don't have a relay like I'm suggesting but you do have connections that could be corroded just enough to cause problems when wet.

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