Julian,
The cutouts in the top rail are from Fluidyne. I think they are cosmetic. The fans are screwed directly to the top and bottom rails, and the housings are essentially sitting on the core. The blades are about 1/2" away from the core. This is how Wilkinson sets up the Fluidyne with Spal fans.
Lee,
This diagram is similar to the way I wired the system. They use one thermostatic switch while I used two with different heat values.
The 10 gauge wire is from Autozone and is an 8 ft roll. It was plenty. The wires are routed in the wheel well.
The fuse holders and relays are from Amazon. https://www.amazon.com/dp/B017...uct_details&th=1
https://www.amazon.com/dp/B081...dt_b_product_details
The relays are powered by the pink wires that previously powered the fans. The pink wires go to the switches, then white wires go from the switches to the relays. The thermostat switches turn the relays on/off. See photos below. I got the radiator, fans, thermostat switches, and rubber elbows all from Wilkinson.
In the photo above the fans are grounded to the studs that were for the original relays. You can also see a rivet that grounds the relays to the mounting plate. The white wires go the thermostat switches.
This is the outlet thermostat switch. It is the upper of the two switches.
