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This is a head scratcher for sure. Sounds like your coach batteries are fully charged now at 12.7 vdc unloaded. In order for them to have charged, the converter connections to the coach batteries must be good (use/store is on; all breakers, use/store latch relay connections good). So why does the gen starter not kick on when you operate the gen start switch from coach batteries only (with engine not running)?
Let’s try some additional things to see if we can get a bit more information: with use/store on:
1. Have you tried starting the gen with the switch right on the gen (with coach engine off)?
2. Start the coach engine and let it run for 5 minutes. What DC voltage reading do you get on the house batteries? It should be high 13’s or in the 14’s. It should be the same as what the chassis battery charging voltage is.
3. With engine off, operate and hold the emergency start relay switch near driver seat and then try to start the gen. Might need the DW to help unless you have very long arms.
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