#3 wire, White, is the ignition switched power output from the switch that feeds a lot of things in the fuse box.
Brown is the power into the switch from the maxi-fuse under the hood.
White/Red is the starter relay trigger and the white/orange is the accessory switched power.
As too why it blows the fuse...? Could be lots of things. Make sure you have the positions on the ignition switch right and then dig out the multi-meter.
I do not check PMs. Call or email if you need something.
ECR is not a parts source. We are not in the mail order business.