12v ignition

[1968ls2fisher]

Hey guys I'm looking for a bit of help. I have a 68 camaro with a stock fuse box. I swapped in a ls2 with dual rad fans. Now I plugged into the stock fuse block to get the 12v ignition powers. And today I blew two fuses. And both times the fans were on. I'm guessing to much load. Here is my question even tho it's a 12v ignition does the circuit still pull power while engine is on. . And is there a better place to get the 12v ignition thanks.