Quote Originally Posted by Crawdaddy View Post
That might be why the fan failed. I've read those fans pull over 50 amps continuous on low speed and a lot more when they first turn on.
yeah, it just pulled whatever it wanted out of the battery. there were 2[hot] wires comming off the fan, one for the 4,000+ cfm and 40+\- amps, and one for about half that... i wired it to the lower speed first, and thats all it needed. these trucks have nice huge radiators and big gaping grilles, so it never went above 210. i would even switch it off on the highway if i knew i wasnt going to be in any traffic.

as soon as i call summit and get the relay matched with the fan i want, i post pics of the install.