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 - The Day Mom Drove the 8N - by Brian Browning. My Dad was wanting to put in a garden but couldn't operate the 8N and handle the old horse drawn plow he had found and rigged up to use with the tractor. Well, he decided to go get Mom out of the house and have her drive the tractor while he walked behind the plow. You got to understand that while my Mom is a hard worker who will always help whenever she can... she had never operated farm machinery before that day. Dad got her out there, explained how the clutch was the same as in our o
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