William,
Out of ideas as I don't have a schematic of the VIM itself. If you haven't yet, suggest you download and reference the "2003 Patriot Thunder Schematics Marquis, and other models 98 – 2003 Mixed". It's located in the Members Only Coach Assist section and has the best quality prints I could locate. You may also want to call BCS to see if they have a wiring diagram of the VIM itself or any ideas.
Good Luck, Steve