Thanks for all the help with the pics. It looks much better now. I'm kinda new to this and any help is much appreciated.
You had me scratching my head on the inverter. I do have an inverter, so I went out to check on it. The inverter is wired directly to the batteries. This relay does not affect the inverter operation. The inverter will still operate with the relay switch off.
The relay will disconnect everything else from the batteries. This includes jacks, lighting, tv, everything etc.,etc., this includes the gas detector. (It may also disconnect the breakaway switch for the brakes. I haven't confirmed this.) This is good for storage, but it may be a liability issue for some. Just a thought.
Thanks,