| Onan starts then immediately dies [message #321429] |
Mon, 31 July 2017 12:11  |
Kennet_D
Messages: 5
Registered: April 2017
Location: Troy, OH
Karma: 0
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Hi folks. Some of you may have seen on one of the Facebook sites that I had trouble with the Onan during a camping adventure last week. I'm no electrician, but thankfully my father-in-law was with me and is fairly knowledgeable about such things. After going through the troubleshooting steps in the Onan manual, we were only able to make it run by jumpering 12V from the 5A fuse directly to the ignition coil. After doing so it would start right up via the pushbutton. We could then remove the jumper and it would continue running.
My control board is still the original. Is it worth attempting to repair it (not that I know what to do in order to fix it), or is a modern replacement Dinosaur version the recommended way to go? My father-in-law's opinion was that a new board would likely be less serviceable, basically a throw-away kind of thing vs. the original. I just need the darned thing to work.
Any advice is appreciated!
Kennet DeJesus
Troy, OH
'75 Glenbrook 26' (6000W Onan)
1975 Glenbrook 26'
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| Re: Onan starts then immediately dies [message #321435 is a reply to message #321429] |
Mon, 31 July 2017 13:42  |
C Boyd
Messages: 2629
Registered: April 2006
Karma: 18
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Senior Member |
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Sir, if you pull the Onan out and look at the side with the control board there is a starter looking solenoid to the lower left with a big hot 12volts in and a big wire going to starter. There is a small wire coming off it going to the board that should have 12volts while cranking only. It fails internally sometimes. If it does not have 12volts at cranking you can make a short jumper wire to go from the big wire on the solenoid that goes to the starter and the little wire going to board on solenoid.
rydfly wrote on Mon, 31 July 2017 13:11Hi folks. Some of you may have seen on one of the Facebook sites that I had trouble with the Onan during a camping adventure last week. I'm no electrician, but thankfully my father-in-law was with me and is fairly knowledgeable about such things. After going through the troubleshooting steps in the Onan manual, we were only able to make it run by jumpering 12V from the 5A fuse directly to the ignition coil. After doing so it would start right up via the pushbutton. We could then remove the jumper and it would continue running.
My control board is still the original. Is it worth attempting to repair it (not that I know what to do in order to fix it), or is a modern replacement Dinosaur version the recommended way to go? My father-in-law's opinion was that a new board would likely be less serviceable, basically a throw-away kind of thing vs. the original. I just need the darned thing to work.
Any advice is appreciated!
Kennet DeJesus
Troy, OH
'75 Glenbrook 26' (6000W Onan)
C. Boyd
76 Crestmont
East Tennessee
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| Re: Onan starts then immediately dies [message #321466 is a reply to message #321429] |
Tue, 01 August 2017 01:27 |
Ken Burton
Messages: 10030
Registered: January 2004
Location: Hebron, Indiana
Karma: 10
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Senior Member |
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Your symptoms are an indication of one of three things:
1. Low oil or defective oil pressure switch.
2. Low AC voltage coming off of the alternator.
3. Bad component in the K2 relay coil circuit.
Item 1. Disconnect the oil pressure switch and see if it runs OK. If it does, check the oil level and/or replace the oil pressure switch.
Item 2. Read the AC voltage on pins 8 to pin 5. It must be 28VAC minimum. If it isn't, you need to look at the alternator coil or voltage regulator for the problem.
Item 3. Probably C1, R1, or CR1 on the board have a problem. I would replace C1 first.
Ken Burton - N9KB
76 Palm Beach
Hebron, Indiana
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| Re: [GMCnet] Onan starts then immediately dies [message #321525 is a reply to message #321466] |
Wed, 02 August 2017 06:07 |
Jim Miller
Messages: 501
Registered: March 2008
Karma: 10
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On Aug 1, 2017, at 2:27 AM, Ken Burton wrote
> Your symptoms are an indication of one of three things:
> 1. Low oil or defective oil pressure switch.
> 2. Low AC voltage coming off of the alternator.
> 3. Bad component in the K2 relay coil circuit.
This particular problem sounds a little bit different than usual and IMO it can only be caused by the control board - Ken's symptom #3 above.
The original message said "We could then remove the jumper _and it would continue running_” (emphasis mine).
Symptom #1 or #2 would cause the unit to _stop_ running upon removal of the jumper.
If it were me I would replace the control board especially considering that it is the original.
Kennet - the new board is almost an exact copy of the original. It is equally serviceable and is better made. I’d suggest buying the version that has the harness leads soldered in place rather than the one with the flag connectors; this eliminates the flags as a potential point of failure.
—Jim
Jim Miller
1977 Eleganza
1977 Royale
Hamilton, Ohio
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Jim Miller
1977 Eleganza II
1977 Royale
Hamilton, OH
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