I wanted a modern fuse box in my GT, so I purchased a 12 circuit and tried to follow the instructions that Charles Goin shared, step by step. No problems right? Wrong. I found out quickly that I was in over my head. I tried several different ways to get it back together, but none of them worked. So when I was at a car show (minimal wiring so it would run) I asked one of the "big" buys if he did wiring. His response was "I hate it, but I do it". I let him have my car, he said it was going to cost a lot of dollars to fix it right. I said, I don't care, just fix it. Well it was subcontracted to a guy that specialises in wiring, he got a lot of money and spent more time than I paid for. He was looking for work and needed something to hold him over, so that was the project. The best phone call I ever got was my mechanic saying that it was finished and everything was working the way it is designed to. So I am going back to Kool April Nites in Redding, CA. This is where I met my mechanic (he only does classic cars and was an Opel mechanic for probably five years). The moral of the story is, if you are not absolutely sure you have the skills to rewire a car, give it to the professionals. Yes it cost money, but in my case, they had to clean up my mess, then start from scratch.