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Old 10-20-2009, 03:12 PM   #1
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Onan 7500 problem

Hi folks,
I posted this on the Monocoers site as well.

Over the past two years the generator in our 04 HR Imperial (Onan Quietdiesel 7500) has faulted on a code 11 several times. Today I got the time to dig into it and look for a reason.
I unplugged shore power and started it. As soon as the load built to 4a it faulted. I repeated the process several time to confirm a hard failure. I then went to the main power panel and turned off all the brealers but the two mains. I restarted the genny and it held. I then started adding loads by turning on the breakers one at a time then waiting a couple of minutes between. I turned on the inverter breakers last and the darned thing held, for 2 hours with the electric element in the Aquahot on and the A/Cs both on.
There have never been any issues when the coach is on shore power. Any ideas or indications to look for folks?
Ron
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Old 10-20-2009, 04:19 PM   #2
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When you start it with all the loads on, how long does it take before the generator faults? Is it possible the time delay before loading the generator isn't enough for it to be ready to take the load? When you started it with the breakers off, it may have had enough time before you turned the breakers on to warm up and stabilize the engine and electronics.
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Old 10-20-2009, 09:13 PM   #3
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Quote:
Originally Posted by tquarles View Post
When you start it with all the loads on, how long does it take before the generator faults? Is it possible the time delay before loading the generator isn't enough for it to be ready to take the load? When you started it with the breakers off, it may have had enough time before you turned the breakers on to warm up and stabilize the engine and electronics.
I'm going to go out and do a cold start tomorrow morning to see what it does.
Today it was faulting when the load was picked up and the ammeter started showing around 4a. It always runs for about a minute before it loads up.

What it has done in the past is after a period of time sometimes up to an hour it would fault, then continue to fault in a serial fashion, usually while driving to get the A/Cs running, or run the microwave at a rest stop etc. Our microwave will run on the inverter but it is painfully slow, taking 2-3 time as long to heat something. I hate intermittents, they take forever to find and if you need to take it in hours of repair time at big bucks per hour!!
Ron
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