well that does depend.

did it come on immediatly?

does it still come on when you hook up the battery?

it could be the low end doesn't work, but 2 of them? or is that seperate from your controler?

if so, swap them between fans and see if the on follows it.
if not,seems more likely you crossed up wiring somewhere, and you are back feeding past the thermostat switch.

so while you think you wired it perfectly, it would be best to go over what you did.