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 7/31/2004 1:30 PM
 
I have an Onan 4000 GenSet in my 1992 Fleetwood Tioga. It will start immediately upon pushing the switch but dies just as soon as I release the switch. Is this a simple problem or is more investigation necessary? Thanks.
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 7/31/2004 2:05 PM
 
Had a problem like that on a 4KW Onan. It turned out to be the switch on the generator itself was stuck in the stop position. Starting it from remote switch (inside the coach) the generator would start and die as soon as the switch was released. After a few hours of trouble shooting found the problem, tapped the switch and it popped back to the middle position, no more problem. In addition check the oil, if it's low the generator won't keep running either.
Earl 2003 CC Intrigue Retired Submariner

Earl 2003 CC Intrigue Retired Submariner
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 7/31/2004 2:13 PM
 
A stidking button would do it but we had the same problem on an 7.5 KW Onan used for emergency power for some equipment racks. It turned out to be a bad resistor on the circuit board that would not energise the run relay. Switch cranks the engine then when it starts a run relay is supposed to stay locked in until the off button is pushed.

The bad thing about being retired is you never get a day off.

tfjones Duct tape is like 'The Force'. It has a light side and a dark side, and it holds the universe together. ..
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 7/31/2004 3:33 PM
 
Thanks for the reply. This problem occurs when trying to start it with either switch. The oil level is full. Thanks, again.
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 7/31/2004 3:39 PM
 
The answer above is correct. The circuit uses a latching relay to maintain ignition power once the key is released from the crank position. Onan uses an oil pressure sensor or oil level sensor to protect against lack of oiling. If the sensor tells the relay not to latch, then the engine will only run in the cranking position. If a sensor is bad, then it will tell the latching relay a lie regardless of oil presence. The same for an alternate switch -- if another switch connects the circuit to ground then the latching relay will also fail to hold in. Saludos!

David

Saludos! David
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 7/31/2004 3:44 PM
 
Where is the relay located? Is this something I can troubleshoot/repair myself? Thanks.
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 7/31/2004 4:31 PM
 
Ours was on the circuit board. This was a diesel but was not a model used in RVs. I would guess that it most have the same basic circuit board.
Get a schematic and you should be able to find it. The bad resistor was evident visually. Actually it had corroded and came off the board.
David is correct it was called the latching relay.

tfjones Duct tape is like 'The Force'. It has a light side and a dark side, and it holds the universe together. ..
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 7/31/2004 6:32 PM
 
You should have the generator checked by a qualified technician. The most likely cause is the voltage regulator on the generator. The gen uses the coach battery to start itself, it does not use the coach battery to run. The gen engine runs from the power the gen produces. If the regulator goes bad it won't make power, so the gen dies as soon as you let off the button. I have seen this many times. I would have it checked because the voltage regulator is pretty pricey and its an electrical item which can't be returned once you buy it. Hope this helps
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 8/1/2004 9:51 AM
 
You have some good advice here but I would put my money on the cheap fix. I had a similar problem and it was the oil pressure sending unit, located on the block. Less that $10 at Auto Zone or any automotive parts store. You can check the sending unit by shorting the wire to the engine block and trying to see if it will run. If it does, you are in business. know where the problem is. If not, try one of the other fixes sent in. Bob K from PA

Bob and Gwen K from PA '99 Endeavor 37WDS4 2009 Ford Tarus or boat Four cats
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 8/1/2004 10:01 AM
 
A simple test to determine if the wiring to the remote starting switches has anything to do with the problem is to unplug the connection to the remote switches at the genrator and try starting the unit from the starting switch located on the genrator. I had a problem like the one you describe it turned to be a bad remote remote starting switch.
Don

Donald W Filadelfia
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