[FreakyMalo]

I found a much simpler solution to the F*rd solenoid. Replace your battery cables with welding cable. The type for a stick welder. It's heavy gauge and designed to carry a lot of amps.
I had the hot start issue; mine would slowly drag the starter and sometimes a jump would help but most times not. I redid the cables and had zero issues for 5+ years after that and the temps go 100+ here in the summer. I soldered my terminals on with a propane torch and rosin-core solder for a more corrosion-resistant connection. Be sure and use rosin-core because it's acid free. Find it at any Radio Shack.

The difference is in the filaments. Automotive battery cables have a few dozen fairly heavy filaments inside while the welding cable has a bazillion little tiny ones. When the electrons travel down the cable, they travel along the surface of the wires not through the middle. Smaller filaments provide more surface area, allowing more amperage to pass through.

The best part: you won't have all that extra stuff bolted to your firewall.