12 Volt 40 Amp Relay Wiring Diagram – Easy Wiring Nov 23, 2021Contactor 2 pole 40 amps 208240 coil voltage. 12 volt relay wiring diagram Caravan Relay Wiring Diagram Valid Elegant 12 Volt Relay Wiring Diagram Diagram. 86 Fused 12V power to relay coil. As in the diagram a wire is run from a 12 volt power source to the switch in the cab then run a heavy gauge wire from the battery to the relay placing a 30 amp. Ford wipers wiring diagram — Ricks Free Auto Repair Advice Mar 17, 2018• 10A fuse for the low current board in the SJC to receive the washer signal from the MFS and provide ground to the washer relay. (the low current circuit board is in the SJC) Check those fuses first. Then check for power at the relays. Follow the Ford wiper wiring diagram and check for power at the relay contacts and control coil.