Do you use a thru-firewall setup like these or do you pass the positive wire thru a grommeted opening? Techflex covering or something heavier?I run it up and under the back seat and then inside the passenger wiring gutter. I add extra conduit on the cable for protection. I don’t fuse it or use Ford solenoids, just like the OEMs….
I use the thru bulkhead like the one on the left. Just techflex, one or two layers. The insulation on that OEM cable is quite thick.