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Old 05-16-2018, 08:21 PM   #1
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Onan7.5 Generator Code 46

I have a Onan 7.5. It tried to start for 20 seconds a stopped cranking. It now reads Code 46. What can I look for??
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Old 05-16-2018, 08:35 PM   #2
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Owners, Service, and Parts manuals can be easily found across the Internet.
The Service manual includes codes and troubleshooting charts.
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Old 05-17-2018, 10:18 AM   #3
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Hi ! Welcome to IRV2! We're sure glad you joined the gang!

I don't have my Onan manual handy but if someone doesn't give you the info I will get it and check the code later.

Good luck, happy trails, and God bless!
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Old 05-17-2018, 12:24 PM   #4
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Fault code 46 is Inverter power supply fault.


The inverter relies on 12 VDC provided by the battery and battery charger. Any issues with the batteries or battery charging system could cause this fault.


In cases where the generator battery is the same as the start battery for the main propulsion engine, cranking the engine while the generator is running could cause this fault.


Under what conditions does this fault occur? Does it crank strongly? Are your batteries getting weak? Is your battery charging while on generator?


If you provide a model number or serial number, I can give you more specific information to your generator.
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Old 05-21-2018, 04:48 PM   #5
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Yes the Gen was runnig when I started the coach and those batteries were dead I have separate batteries, Chassis/Coach. The coach batteries were bad and replaced. I even disconnected the battery power at the generator and jump with a car and it would not start. Any idea's? How can you reset and clear the code.
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Old 05-21-2018, 05:13 PM   #6
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The codes can't be cleared per se. If the generator shuts down unexpectedly it will show a code(s).

Check out these threads for more information;

ONAN Genset Fault Code 46

Onan generator won't crank.
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