I just posted some photos and info, (along with posts from others), on the IH forum. The original plugs are run in series and run at less then 1 volt. When one blows, none work. Bosch came up with much faster and durable plugs as an update for the Mercedes 190D car. 190D new had the same plugs as your BD154 engine, so the new plugs are a bolt-in swap. New plugs run at 9 volts and get wired in parallel. If you want an indicator, you need a 12 volt indicator bulb.
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Today's Featured Article - When Push Comes to Shove - by Dave Patterson. When I was a “kid” (still am to a deree) about two I guess, my parents couldn’t find me one day. They were horrified (we lived by the railroad), my mother thought the worst: "He’s been run over by a train, he’s gone forever!" Where did they find me? Perched up on the seat of the tractor. I’d probably plowed about 3000 acres (in my head anyway) by the time they found me. This is where my love for tractors started and has only gotten worse in my tender 50 yrs on this “green planet”. I’m par
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