Chase Bays - Dual Fan Relay Wiring Harness with 180º F Thermoswitch (CB-2FANRLY)A very common problem we ran into when selling Radiators was insufficient fan wiring. In many cases; powerful electrical fans are installed on chassis that came with mechanical fans. The factory A C relay(s) that use smaller gauge wiring are tapped into and wire that cannot handle the high amperage is used to run to the fans themselves. If its not that, its that one relay is used to power two fans. Either way, the issue is half powered fans and a