Vw Beetle Radio Wiring Diagram - The stock ignition systemwell, it's in need of improvement. It's not like any other Bosch equipped 70s vehicle is any better nor would I recommend you replace the Bosch/Beru components 1:1 with another brand but there are some improvements you can make to restore some of the power waiting to be released in that 2L bus engine.. The four major parts of a vehicle are body and exterior (e.g. doors and windows), electrical and electronic (ignition system), interior (car seat), and powertrain and chassis (engine).. MANUAL SECTION. The (IND#X) is an inventory control number; I do not sell my originals, if you can use a clean copy or need a couple/few pages of scanned info I can assist you - THIS IS NOT A FREE SERVICE AS MANY SEEM TO THINK!!.