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  1. K

    2005 4.3 liter Mercruiser ignition trouble

    This all started when the boat was running. Everything was going great until it wasn’t. Still think ignition switch? It’s easy enough to check and I will just thought that info might help point a direction. It was like I ran out of gas.
  2. K

    2005 4.3 liter Mercruiser ignition trouble

    Very significant voltage drop at the + terminal of the coil when cranking. Good for a second or 2 then falls to about 4 volts. I don’t understand the system well enough to know what that means. Bad coil I would guess. I did same test on the battery and did not see voltage drop off like that.
  3. K

    2005 4.3 liter Mercruiser ignition trouble

    It is a Quicksilver with 3 wires. Looks identical to the one I took out. I will check the voltage.
  4. K

    2005 4.3 liter Mercruiser ignition trouble

    I’ve been searching threads and found the helpful flow chart for trouble shooting the thunderbolt ignition system. I am up to the point where I have a spark tester on the coil and the other end connected to ground ( I have it going to a spark plug) and I get a spark when I strike the green /...
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