The only way to really test this....is to hook up the Maverick as you would when ready to pull out towing.The battery going dead is so going to happen. Maybe the charge line isn't connected to the proper spot in the maverick? It was installed by a commercial place but who knows!
Then with coach engine off, no generator running, and no shore power, test the voltage of the Maverick battery under the rear seat from the terminals. It would be good to test right away...then a couple hours later. Maybe turn on the headlights manually for 20 seconds or so. That gets rid of the flash charge in the battery. It should be reading 12.6-12.8 volts DC after sitting a bit. Then start coach engine and check. It should immediately show something at least in the mid 13 v DC range. If no change.....your charge line is not adding power.
There must be increased voltage after starting the coach engine. That is what you are looking for. You COULD see 13 volts DC at the Maverick battery right after shutting it off, but that does not mean it is getting power to the battery from the coach. Again, you are looking for a change in voltage. If that isn't showing something when parked, I would check again after an hour or so of towing.
The Maverick battery cannot go dead if it is getting current from the coach unless that current is interrupted ( maybe a breaker is installed instead of a fuse and is shutting down?) or the battery is shorted internally. If the Maverick operates normally when not towed, that is not the case. This is something simple, but maybe not so easy to figure out.
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