Have a 1975 240D that I just updated to the newer Bosch pencil type glow plugs and am having starting problems. I replaced the loop style plugs and removed the grounding strap on the first plug and am using the original starter pull switch. The kit came with a relay but I'll be damned if I can figure out how to wire it into the older system. If the car is left alone for a couple of hours it fires right up, subsequent attempts to start it fail though. When I pull the starter knob nothing happens, no clicking from the starter motor it's just dead. Battery has a full charge and is a new Bosch unit and I've checked all the grounds and they seem to be fine as well. Is it possible something is either shorting out or maybe my pull switch is going. Was there something else I need to do to insure the new glow plugs are correctly installed, did I miss a connection? Kind of at my wits end. Going to replace the + battery terminal wire tomorrow any other ideas would be a great help. The newer plugs really are great as when it does fire up it kicks in on the first pull. Used to take about three or four tries with the older loop plugs.