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    Merc 850 Internal Wire Harness?

    My Merc 850 Thunderbolt is 4 Cyl, 1973 or 1974, Serial #3877880. The original Internal wiring harness is part # 8466055, this unit has 6 male post in it. The CDI electronics replacement part is 414-2770, this part has 7 male posts in it. When that extra 7th post plugs into my external wires...
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    Grinding Wheel?

    Is there a popular opinion on which wheel cuts 1/4 in fiberglass mat the best? I am using an electric grinder with a wheel that is labeled for cutting metal. I saw other wheels at Lowes for cutting wood.
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    850 Thunderbolt

    Hello.. Can anyone help me understand if their is a serial number range to determine if my 1973, 850 Mercury Thunderbolt has either of these ignition systems. Distributor CD Ignition, Or Distributorless Ignition
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    Here I Go

    I had no idea I was going to get a boat a couple days ago. I was scrolling through Craigslist and went a nd picked up this beauty. She is a 1973 CEE BEE Manufacturing, Avenger. She is powered by a sweet running Mercury 850 Thunderbolt. However.... I am in the wonderful process of redoing the...
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