Electric fan wiring??????

FWIW, most late-model factory vehicles run the fans separately not for redundancy issues (Let's face it, the factory isn't that concerned about keeping you alive forever). They do that so that one fan runs normally, the other kicks on when the A/C is being used to accommodate that additional load and keep the condenser cooling. The factory shies away from running both as an economy measure, and they can do what they can to get those fuel economy numbers up.

As a measure of scale, my Neon (bone stock) has had some as-yet unknown issue keeping either fan from running for the last month, with some extended days over 100. It's yet to overheat although the gauge has started climbing if I sit in traffic. This is WITH the A/C on. Beyond that, you'd never know that the fans weren't working.

Aluminum radiators are a blessing!

I will wire separate relays and run dual fans for my Dart (aftermarket aluminum radiator) unless I get lazy and use a late-model power distribution block. I plan to try and adapt a late-model Ram condenser, drier, and lines to my Magnum pump and Dart evaporator, so if it weren't for that I would just run a single fan.

I'm curious, what temp switch are you using if you're not buying a $45 kit?