Charging system

Probably best to redesign the system. It new strategy to deal with the new goals. That stuff will be running on battery with the engine off. Additionally the battery will get drawn down further. As a result there will be high charge rates unless you have a way to control that because the recharge voltage is fixed.

Played around with some ideas in this thread, including ways to monitor the charge rate.
https://www.forabodiesonly.com/mopar/threads/fusible-link-or-not.458737/#post-1972904806
And more recently here without an ammeter.
https://www.forabodiesonly.com/mopa...-alternator-to-the-bulkhead-connector.556920/
Good luck and keep folks updated. It will be a lot of work but could be rewarding if you like that sort of project.