1.8 L alternator question, Smoked the wiring Options

[Mcraneiowa]

I installed a new hundred amp alternator on my 74 1.8 L 914 a while back. I was using the old wiring harness and ended up smoking the harness. Ended up blaming it on a short period I had the alternator checked out put in a new voltage regulator and installed new wire harness. Well today again it’s smoked the harness. The first comment everybody would make is that I had a short. I would’ve agreed with that possibility the first time but the second time I was more than meticulous to make sure I insulated everything to prevent that from happening.

So my question is, with a 100 amp alternator replacing the old 55 amp alternator is it too much amperage running through that gauge of wire and causing it to get too hot and melt? I’m thinking this might be the case since I’m going to have to replace it now for the third time. I’m getting the old Bosch alternator rebuilt and another new wiring harness. I would appreciate anybody’s thoughts or comments on this or if anybody else is run into this. Had the car running for about a half hour before it decided to do this today