I am locating an oem style air pump into the right (passenger) side wheel arch behind fog light above ambient temp sensor.
Since I currently have no engine or battery in car I can not do the normal volt meter routine.
I really would like to tie into a switched power that comes on and goes of when the key is turned on?
I can not find the correct wire diagram for the early version e39 that I have.
I would like to do it once the right way so any recommendations would be much appreciated.