Kevin Reay
Daily Driver
That is true many will draw power from other common actives,but they don't have to be if you are happy to run more wires. Cost is unexceptionable on a production run not a problem for one car. What I was getting at is that one system is not relying on the operation of another as is with a modern computer car.Regarding stand the alone wiring layout. Unfortunately there are also a lot of "non-stand alone" things, like piggy-backed power wires, daisy-chain branched circuits, etc, that can confuse the otherwise isolated systems.