I have a single 16in. 2000cfm spal pusher, in my 292 powered AD. mount the fan high at the radiator about a 1/4-1/2in. away from the rad itself. do NOT use a fan shroud on a pusher ...... only a puller. i used two relays to power the fan and each one has a fusable link. this is done because at start-up a fan may draw more amps then a circuit usually handles. some disagree w/ this thought, so a common 30amp relay costs about $5-6bucks each. cheap insurance. also if one fails the second is there hooked up and working. the 'aux. control' thermostat switch is located below the truck thermostat with that wire runing to both relays.
http://s67.photobucket.com/albums/h298/1951otter/?action=view¤t=0732700-R1-010-3A.jpghttp://s67.photobucket.com/albums/h298/1951otter/?action=view¤t=0732700-R1-034-15A.jpg wire each relay::
#30 to main batt power via a fusable link.
#85 to ground.
#86 to Auxiliary temp Fan Switch.
#87 to fan
ground fan at fan/radiator frame.
make sure radiator frame has a GOOD frame gound to chassis frame.
my aux switch turns on/ triggers at 185-190 degrees.
in the next photo you might beable to see the aux thermo switch (it has no wire attached here)
http://s67.photobucket.com/albums/h298/1951otter/?action=view¤t=19A-1.jpghttp://alanhorvath.com/54chevy/mad_electrical_2.php
