My fans have this , and I just bought a replacement off of amazon <| sep |> Make a Kyle Katarn Mara Jade flick already and take my money <| sep |> I would use a rib relay , something line this Cj 0 KEQiAvNrBBRDe 3 IOwzLn 6 O 4 BEiQAmbKDtZfFEK 7 sSzlLx 5 u 6 uGKt 33 n 3 VCZFMFowM 7 K 5 BhCv 0 UaAgl 98 P 8 HAQBoth inlets get wired to neutral and ground . For the front hot , wire it to blue . For the rear hot wire it to Orange and whiteblack . Wire whiteyellow to neutral . Wire yellow to the hot of the vehicles 120 v wiring . When powering it via front it will go from the blue NC to yellow . When powering it via the rear it will close the relay and power via Orange . If you plug both in rear will take priority . If that relay does not meet your load requirement they do make larger units .