I don't think it's necessary. We already have an electrical forum and you don't want to get too diluted or it'll get REALLY confusing what goes where (I already think it is).
I think a wiring forum could be very useful. It could cover all of the different models and their wiring harnesses. Tips and DIYs to help. Maybe even after market wiring, like Megasquirt or even simple Hot Rod wiring kits for project cars.