Hi - I have recently bought a timer switch for my 412. It's the one built into the clock. It all seems to work but I cannot figure out the wiring. The eberspacher manuals don't seem to help as none have the timer switch details/wiring. I have to connect up terminals B, 15 and 30 on the back of the timer. Can't figure it out. Does anyone know? I want to be able to warm up the car in the mornings before going to work!!!