I DO NOT want to use a wiring harness kit like what painless wiring offers, its not what I am looking for. I have a 1971 BMW 2002 that has a rather scerwed up electrical situation so i have planned to make my own harness entirely custom and more reliable with more features actually within the harness itself.
What I am wondering right now is how do I calculate fuse values for particular circuits? Like for example say that the headlights and a couple of other things (like blinkers, etc) are on the same fuse in the original wiring, but through my own schematic it is different. Just theoretical right now, I havent drawn up any routes for this yet, but I know the stuff wont be all the same. This would change the fuse values, right? How would I tell what the new fuse is that I would need?
Also, stock, my 2002 has a 12 fuse fusebox, which does not have a common power bus. This allows the original wiring to have switches, relays and components (lights, blinkers, etc) on separate sides of the fuse. The fusebox that I am looking at is nearly identical in dimension and has 16 fuses, but with a common power bus for all 16. This forces me to have the power coming in one side for EVERYTHING then all the relays, switches and components on the other side of the fuse. Would this change fuse values itself too or is that not important in the electrical world? I am totally new to this and need all the help I can get and be pointed at good resources.
Thanks a lot, I'll clarify some things if you dont understand what I am talking about somewhere.
on edit ---- does this mean (having a common power bus), mean I would need either two busses or two fuse boxes due to ignition powered circuits and straight battery powered ones? BTW, the fusebox I am looking at is the BUSSMANN RTA Fuse Box
It says it can be available with one or two busses but I'm not sure if the number of curcuits per bus can be custom, looks like it would probably be by multiples of 4 fuses which is the size of each module for the box, if you look at the PDF file you'll know what I mean.