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Old 12-04-2022, 08:06 PM   #1
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Onan 7500 quiet diesel won’t crank

Hi everyone, I finally got my generator running the other day for the first time of owning my rv. Ending up being a bad fuel pump.
Replaced it and ran great that evening. Ran probably 30-45 minutes without load then ran with load to make sure AC’s would work and all did just fine. We use shore power 99% of the time and live in it full time but have a trip coming up and have to have the generator. Today went to start the generator just to be sure our trip is coming up at the end of the month and nothing. No lights on the switch and doesn’t try to crank. Checked over all the fuses I can find (3 at the generator) multiple in the battery area. I have power coming to the generator but the switches won’t try to turn it over. I was thinking maybe bad switch but both at one time? I also have power on 2 terminals of the switch but when I flip the switch in one direction I loose the 12v on the one terminal but not the other. I was also thinking starter solenoid but would think I should at least have the light still on the start/stop switch and do not. Maybe if someone has a wiring diagram that would help. (611-1236) Any help would be greatly appreciated, Thanks!

1999 fleetwood American dream
Spartan chassis
7500 Onan diesel quiet generator
Model 7.5 hdkaj/11451d
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Old 12-04-2022, 10:08 PM   #2
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How long did you hold the start button? When it’s cool outside, you may have to hold it quite a bit while it preheats……
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Old 12-05-2022, 03:12 AM   #3
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A long time on multiple occasions and it’s not cold here in Florida.
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Old 12-08-2022, 04:54 PM   #4
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Did you shut it down under a load? The boards really are fickle about that. Disconnect the 12v leads off the back of the generator for 20 minutes. The board will reset if it's good.
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Old 12-09-2022, 05:21 AM   #5
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Did you shut it down under a load? The boards really are fickle about that. Disconnect the 12v leads off the back of the generator for 20 minutes. The board will reset if it's good.
No. Shut down normally and came back days later and now won’t even try to crank over.
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Old 12-09-2022, 07:13 PM   #6
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Schematic

Found the schematic but still nothing on if it acts like I have no power when I definitely do.
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File Type: pdf onan_hdkah.pdf (75.9 KB, 4 views)
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Old 12-10-2022, 05:23 PM   #7
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I have seen several posts of the wires entering the Genset upper rt shorting and or poor contact.
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Old 12-11-2022, 06:45 AM   #8
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I have seen several posts of the wires entering the Genset upper rt shorting and or poor contact.
Where would that be exactly?
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