ramchargers dual fan wiring help

[1985GN]

hey guys i have a question about the wiring on this setup. i had the stock fan in the car when i got it and it was getting power directly from the fuse box and would run all the time which i liked. the car has a 87 drivetrain in it but when the previous owner put it in thats how it was wired up as i cnat see the stock wiring for the fan and relays. now this is my question i hooked the dual fan setup to the same wire and had no probs for like 2 weeks when i blew a fuse in the line all of a sudden. i redid the fuse and it melted it this time. im nervous that the dual fan setup is too much for hte wiring and is gonna blow more fuses and over heat hte car when i least want it to. what can i do to fix this so i dont have to worry? can i hook the power up directly to the battery and put a switch inline and just turn it on when i want to?? can i piut a fuse relay in from my local parts store?? any idea would be great, thanks

 

[1985GN]

oops posted in wrong section can a moderator move this to tech for me, thanks