Ok did some testing with my battery charger and Mark XIII fan
It seems that the black wire to the right is neg and the blue wire on left is pos, and the other black wire in the center does squat, least it only lugged the fan down when Connectewd with the other black wire.
Man this thing pulls major air at 115 amps on the batter charger, I laid it face down on the dround and could hardly lift it due to the sucking force.
Even at 35 amps and 12V this thing is amazingly powerful. I really dont know if I need an extra shroud around the end of this fan, I am going to go ahead and finish making it then just add the fan with out the larger shroud and try it.
Gota get a temp switch tomorrow then finsish installing and wiring wiring it and I will post the results tomorrow on how well it cools with a 29 year old radiator :P
Thnaks sporter, it was actually labled on the fan but had to clean it to see it LOL.
Chicken the black wires are both the same size, and like I said if i ground it with the other black wire it lugs the fan down, and if I use just the fdummy and power wire it just sucks juice and the fan does not move....Wonder what its for, it ran up into the wiring harness in the car...I may ride out there and check it out tomorrow.
Im assuming htat these relays I pulled from under the hood will work since one of them did come off of the Hole marked FAN lol, I found a website that said the fan pulls 33 amps continous and 100 amps on start up. I would think with a 100 amp fire off it would pop the relay right off, Im just going to wire it up and see what happens...Sporter I hope that new 100 amp alt will do the trick :P I know my power windows barley even pull on the guage now when I hit the switch
Mike