All the Mercedes diesels that use parallel plugs and have a fuse use the same 80 A fuse whether there are 4, 5 or 6 plugs. All of the plugs have identical electrical requirements - a 12V supply (that will drop to 11V or a little less when the plugs are first energized because of the high current and the voltage drop across the battery itself and the connecting wires). Initial current for each plug should exceed 20 A for the first few milliseconds but will quickly drop to less than 15 A and by 20-30 sec should drop to 8-10A. Shorted plugs are possible (I've only heard of a few) but shorted wiring is MUCH more common (wires pinched to the clips, bracket or intake manifold or terminals rotated so they touch something they shouldn't). When plugs fail, they much more commonly open, not short. The resistance of every good Bosch or Beru parallel plug I've ever seen was 0.6 ohms when at ambient temperatures. There is a TINY chance that a plug could measure 0.6 ohms but short (and the resistance drop) as it heated up.
Marshall -- Marshall Booth Ph.D. Ass't Prof. (ret.) Univ of Pittsburgh School of Medicine Department of Pharmacology 1300 BST Pittsburgh PA 15261 USA [EMAIL PROTECTED]
