It is always a pain to get diagrams/info for ML270. I needed a sort of CDI module pinout for a 2003 ML270 & I managed to get the wiring diagram. I could not find this in Starfinder, so I couldn't post a picture of complete diagram. It is a PDF & it is on 4 pages. So you can print them & stick them together. It is for ML270 as of 09.02
