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Old 05-14-2015, 12:04 PM   #1
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Onan 4K Generator Issue-Need Advice

I just purchased a 2013 Fleetwood Jamboree Sport (sweet looking by the way) and when we looked it through the generator worked fine, only has 40 hrs on it. I drove it home, parked it in the drive, set it up to clean it and when I went to start the generator it tried to start, (door was open so steps came down) then shut off and now it doesn't seem to have any power going to the panel, generator or hr meter. No lights, no clicks, no trying to start, nothing. Dead in the water.

Things I've looked at:
House batteries are good
Full tank of gas
Tried starting from cab, no dice
Tried starting at Generator, no dice
Checked all fuses in house battery area and in fuse panel.
Checked House fuses, they weren't tripped

I'm confused because I know the generator runs like a champ but I just can't get it started anymore. It's like there is no power going to this system at all. It may be something very simple that I'm overlooking, but I just don't know.

Is there an inline fuse somewhere that may have tripped?



Todd "Too Many Hobbie$" Horner
2006 Four Winds 5000 29R
Thor Motor Coach
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Old 05-14-2015, 12:35 PM   #2
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Here are the general guides from my Onan 4ky manual.

I would; start the rv and make sure there's 13+ volts getting to the genset first.

The 40 hrs isn't necessarily a good thing. It probably means the owners didn't run it every month like they were supposed to.

Good luck and keep us posted.
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File Type: pdf no crank.pdf (8.8 KB, 38 views)
File Type: pdf No crank 2.pdf (38.1 KB, 26 views)

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Old 05-14-2015, 01:33 PM   #3
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Have you tried starting it with the motor home engine running ?
OH duh - that's what he said.
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Old 05-14-2015, 01:40 PM   #4
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I have a used Class "C" with the 4K Onan. I have found that there are two things that really impede the genny to function properly--grounding & load. Mine will not start if there is a load on it at start-up. What I would do is to check to see if all of your breakers on your MH panel are shut off. My manual says to start the 4K with no load, allow it to run for a couple of minutes before putting the load on it, & to shut the power off before shutting the genny down. Once you remove the load, it needs to run 2 or 3 minutes as a "cool down" stage. Try this procedure to see if it will start.

Also, there is a ground lug that is located to the left of the genny under the Control board. The board will have to be removed to get to the grounds. I have had a ground wire or two vibrate off the lug. When this happened, the genny would start but not continue to run or would act as if the batteries were dead & not engage the starter.

Hope that this helps some.
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Old 05-14-2015, 01:49 PM   #5
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There is a small output breaker switch on the Gen itself (on the lower front center of the gen) But if this is tripped the gen will run but not put out power. Make sure the main power is switched to coach power.
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Old 05-14-2015, 01:58 PM   #6
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From the Onan troubleshooting guide:

CHECK BATTERY VOLTAGE Connect the negative voltmeter lead to GROUND and the positive lead to the
positive battery cable on the starter solenoid and read the battery voltage. The same reading should be obtained at
the BATTERY POSITIVE pin of the control board. A fully charged battery in good condition should read 12.6 to
12.8 VDC. Charge the battery if necessary.

CHECK CRANKING Try to start the engine. If it does not crank, check the control fuse (5A Slo Blo, except models
with electronic governor 10A). If the fuse is good, jumper the positive battery post to the coil terminal on the start solenoid.
If the engine cranks, there is a poor connection, wiring damage or the control board is defective. If the engine
cranks when the BATTERY POSITIVE pin is jumpered to the START SOLENOID pin on the control board, the board
is defective. NOTE: The battery voltage should not go below 9.5 VDC during cranking.
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Old 05-15-2015, 07:58 AM   #7
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If you have house power then read no further. If no, did you turn off the house batteries or check to make sure they are on?

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Old 05-15-2015, 09:48 AM   #8
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To all those that offered advise. Thank you. Just wanted to let you know that I was able to get it fixed by calling Fleetwood Service. It took them all of 10 seconds to diagnose. It was the 125A Bar BUSS fuse going to the generator. See pics. Knew it had to be something simple....well let's say I was hoping it was simple simple.
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Name:	125A Genset Fuse.JPG
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ID:	94319   Click image for larger version

Name:	125A Genset Fuse 2 .JPG
Views:	83
Size:	79.1 KB
ID:	94320  


Todd "Too Many Hobbie$" Horner
2006 Four Winds 5000 29R
Thor Motor Coach
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