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  1. J

    78 Black Max 1500 only firing on one cylinder

    this whole week i've been out on the water on my boat. i'm going to add this just in case it has anything to do with the main problem: about two days ago i lost the power trip gauge. the trim still works, just the gauge will read all the way down, and won't change. the real problem is that i was...
  2. J

    Extreame Runaway Idle 78 Mercury Black Max 150hp

    Couple things first, barn find. 78 Mercury Black Max 1500v 150hp. Amazing condition for the years it has been sitting. Mice ate through a couple wires in engine, already fixed those. Installed new ignition switch, yes the wires are in the correct spot. New battery, new plugs, wires are still...
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