What do you recommend? Trunk Battery, like to put a inline fuse. what size?

[mopowers]

Also like to know what is the correct Ford Solenoid to use?

Bumping this old thread because I'm also looking for a part number for a Ford solenoid that'll work with the diagram above. Will ST67 work?

https://www.napaonline.com/en/p/ECHST67