Trunk mounted battery

If it's an automatic, you need some method of neutral safety. That is part of the reason for the Mopar relay. There exists a couple of "Ford style" starter relays, at least one was used on AMC products. These had THREE small terminals and two main large ones.

Two of them hook up just like Ford, IE solenoid and IGN bypass. The third went to ground through the NSS just like the Mopar starter relay

Here's one now:

http://www.oreillyauto.com/site/c/d...ck=Search_01931_1006568_-1&pt=01931&ppt=C0330

The quick connect "post" terminal in the rear is the NSS terminal