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Old 03-08-2021, 03:01 PM   #1
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Brand: Thor Motor Coach
State: Utah
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THOR #17308
Generator only starts with engine running

Iíve run into a conundrum. Rig is a 2016 Axis 24.1. This started after driving over teeth-rattling washboard roads for several minutes. May or may not be related. Anyway, the short story is my generator only starts after my engine has been running for a minute or so. It continues to run like a champ as long as my engine is running. After shutting off the engine, the generator will continue to run for about 5 to 15 minutes before shutting down on its own. The time it runs on its own seems random. Any help greatly appreciated.

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Old 03-08-2021, 03:27 PM   #2
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THOR #1150
Simple question: Is your use/store switch in "Use"?
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Old 03-08-2021, 03:38 PM   #3
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Of course.
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Old 03-08-2021, 03:46 PM   #4
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THOR #7035
See this thread:

https://www.thorforums.com/forums/f8...ine-22493.html

Post # 22 was the resolution: 100 Amp DC breaker tripped. But the BIRD/BIM was connected to the downstream side of the 100 amp breaker, not the battery side.

USE/STORE Not Applicable

Basic Schematic:
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Old 03-08-2021, 04:34 PM   #5
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THOR #8860
Check your battery connections to the coach batteries.
(you mentioned the bone-jarring ride...)
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Old 03-08-2021, 06:21 PM   #6
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Fuel tank above 1/4 ?
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Old 03-08-2021, 08:32 PM   #7
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16ACE27 is correct; some coaches "probably" have the BIM wired to the gen/jacks side of the 100 amp breaker tied to the coach batteries. There are wiring variations out there.

So the alternator is charging the chassis battery when engine is running.....BIM closes in a few minutes to also try to charge coach batteries, but they are actually disconnected if the100 amp breaker has tripped open. When engine is shut off chassis battery charging stops and the BIM remains closed for a time keeping chassis battery connected to the gen micro controller. Then the BIM opens off the chassis battery connection a few minutes after (since no charging is detected)......and no 12vdc on the gen micro shuts the gen down. An evil scenario, depending on how the coach is wired. Find your 100 amp re-settable breaker and reset is the likely solution per 16ACE27.
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Old 03-08-2021, 08:38 PM   #8
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Problem solved!

Thank you everyone, tripped breaker that the battery tripped on a major bumpy road because itís an inch away has been reset. Nice design there Thor! 😂
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Old 03-08-2021, 08:45 PM   #9
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Glad to see that you got it beat!
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Old 03-08-2021, 09:08 PM   #10
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Yeah, the generator would be happy to continue to run when you take away 12 VDC to it except for one thing:

Gasoline!: No 12 VDC = no fuel pump = no run.
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