Where are you grabbing power for the fans? If you are pulling it from the battery and running wire all over hells kitchen back to the fans, that is not an efficient approach.
JMO, since the fans are likely to run primarily when the engine is running, source power right off the alternator charge stud. You have a short run to the fans. Mount any relays for the fans on that pass side side apron area. On high amp draw items, you want the power runs as short as possible.
Ground the fans direct to neg battery terminal or to the radiator support. Have AT LEAST an 8 gauge ground wire, 6 would be better, from Battery neg to radiator support if grounded there.