I just installed a switch which lights up when it is on (or is supposed to) to my radiator fan and it does turn the fan on but everytime I try to connect the "Earth ground" side of the switch to either chassis or battery -Neg the fuse blows instantly!
I have tried multiple sites and the strange thing is I have the same model switch which works fine running for my LEDs right next to it. I have the switches terminals separated by heatshrink but right now I'm thinking the switch might be bad.
I did a continuity test before I installed it and the switch was fine but maybe I damaged the switch somewhere in the soldering process.