Trunk Mount Battery - Wire Routing

Others, even Chrysler, used seperate solenoid relays at various times. Its just easiest to get one at the parts store by looking up a Ford.
:)

It keeps the big cable to the starter off. Only when the key switch goes to start does the solenoid get the power to connect it to the battery cable.
This is basically @crackedback's schematic - I just moved things around so it was easier for me to read.
View attachment 1715844667

I’m in process of rewiring now. I have the Ford relay in the trunk, but I have eliminated the factory relay under the hood. My NSS is part of my shifter, so I ran the ignition switch trigger wire to the switch on the shifter, then back to the Ford relay. I’m running a Painless fuse box, my alternator cable goes to the fuse box and the fuse box runs back to the battery in the trunk. I also have a 4 circuit fuse block in the trunk now to power my radio/amp, my fuel pump and my EFI, with one circuit empty for now. I wanted direct runs to the battery for those items instead of tying them in somewhere.