If you are unsure which wire is which coming out of the electric fan, find the fan manufacturer's supplied wiring diagram. If you're still not sure, once you've completed all the wiring, let the ...

This is depicted in the professionally-rendered diagram below. From here you can see that, to use a relay to turn on the electric motor labeled “M,” you ground the negative wire of the motor ...

MSD's new Stand Alone Solid State Relay ($153.95; PN 7564) simplifies wiring and features LED indicator lights. It does the job of four relays with minimal wiring. It's another method to consider ...