@ScubaRx had a great idea. Go to the truck fuse box and disconnect the fuse that provides power to charge the Ollie batteries (I am installing lithium batteries in the Ollie).
A great idea to pull the charger wire fuse so there is no power in the line at all to the 7 pin connector.
Unfortunately on my 2024 RAM there is no such fuse for power that would charge the Ollie batteries. The 2024 RAM fuses for the trailer are (1) Trailer tow backup; (2) Trailer stop/left turn signal, (3) Trailer stop/right turn signal, (4) Trailer tow park lamp.
I guess I would have to remove the wire from the "Aux 12V Power" connector at the 7 pin connector, if I want to stop power from my vehicle alternate to not charge the Ollie batteries or find the wire in the Ollie to disconnect, but then there is still power in that wire.
@Galway Girl and others that have converted from AGM batteries to Lithium batteries:
Is the "Aux 12V power" on the 7 pin connector the wire to disable ???
Can the vehicle charge wire to the trailer stay in place when installing lithium batteries ???
Will the vehicle alternate be compromised if the wire is not disconnected ???
Thanks All