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Old 07-16-2011, 08:55 PM   #1
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Generator problem

I'm about three weeks into my new to me 2007 Georgetown 370TS. I can't get my generator, Onan 5500 to start, or should I say stay running. It will start but as soon as I let off the switch it dies. The code flashes 32, which means "low cranking speed fault". I've replaced both coach batteries, cleaned the cables. I have not replaced the oil or filter yet and the generator only has 92 hours. I can't get into the nearest dealer until mid August. Any clues as to what's going on? The generator is really clean and no leaks of any kind. The fuel tank is full.

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Old 07-16-2011, 09:14 PM   #2
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When my Yamaha does this the oil is low. Most generators have low oil cut outs to save the motor. There is a timer that allows the generator to run briefly to pressurize the galleries but if the pressure does not rise it shuts down. Maybe the oil IS low or the sensor is bad.

Just a thought as I do not have a motor home type generator.


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Old 07-16-2011, 10:14 PM   #3
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A few things could cause this. With onan any one or combo of the safe systems such as oil pressure, over / under crank sensors, over temp etc.. will cause the shut down as soon as start switch is released. Also no AC output will cause this. With onan when the start button is depressed the 12 volt systems get their power from the batteries to get started, then as its starting it should start producing 120 VAC when the start button in released it loses its 12 VDC from the batteries and starts receiving it from the gen head side. The gen head is 120 VAC but it is also uses a bit of the 120 and creates a 12V (approx. 10 amp) charge circuit to charge the batteries and run the 12V systems on the gen.
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Old 07-17-2011, 06:59 AM   #4
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So the real answer is, let an expert fix it.
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Old 07-17-2011, 08:09 AM   #5
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As Lou mentionned, check oil level first and top up if required. Most common condition is low oil.
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Old 08-02-2011, 10:30 PM   #6
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I went as far as to replace the oil and filter. Still no generator. I've been told it might be the brushes. Guess I'll check them tomorrow. After I get done, maybe I'll open a generator shop....Not..Ha
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Old 08-06-2011, 10:19 PM   #7
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Might have found the problem....A local truck repair station said I should check the brushes. I pulled them out and found one with scaring on it. I took a file and smoothed it out and the generator started and ran like a charm. I will be ordering another set of brushes to replace those I have in it.

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