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Re: electric fan worth it?
If you have an efficient (3 core/4 core) radiator and cool outside temps (it's been 100+ here lately) electric fans can work. A mechanical fan w/a Hayden fan clutch and the proper fan shroud will always cool better than any electric set-up.
For me it's easier to just wire the fans through a relay and into the ignition switch. Tie into the + post on back of the alternator to feed a fused circut to the fan relay, and then to the fan motors (using thick wire and a 30 amp fuse). The relay will need a ground source and a "keyed" ignition source (most relays have a wiring schematic stamped on the relay). When you turn on the key, the fans come on. There's less chance of fan failure that way.
It's more complex to wire in a temperature sensing control system, usually when the engine heats up and the fans come on, they usually stay on anyway.
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