Replace all the fan wiring you have. If you bought those fans second hand, the heat cycling on the wires directly in the fan output get brittle after x- amount of fan cycles. Ditch what relay you have. Get two 30A spdt relays. Use 14g wiring, and put each fan on it's own relay (20A fuse on each). Throw a 200/190 thermoswitch in your upper rad hose to activate the relays and call it a day. Never looked back after doing so. The fans will pull much harder and without risk of both melting a fuse on a single relay.
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