It's still amazing to see how many experts are on this forum. I've been helped greatly in the past and am hoping for some more help now. I'm still running a 1978 175 Black Max. Saturday the engine became sluggish and wouldn't rev past about 1500rmp. Changed all the spark plugs, still had the problem. Checked spark and found #3 wasn't sparking. Checked coil, worked fine. I'm now thinking of trigger, stator, or switch box. The interesting thing that I don't understand is after sitting for a few minutes, the plug would spark once when first turned over, and then never again until I repeated the process. Very strange...
FYI-the trigger wires were very corroded when I bought the boat 3 years ago. I replaced them all and didn't have any other problems with spark until now. I have had intermittent problems where the engine wouldn't kill after running, almost like half the motor shut off but the other half didn't. I replaced most of the ground wires and still couldn't fix the problem so I've been killing it with the choke. However, whil playing around, I found that the mercury switch would kill it just fine. Any help on this would also be great. I now need to replace the trigger, my last fix is not going to survive any longer. Where's the best place to find one? Also, could this be more than a trigger?
Please help.
FYI-the trigger wires were very corroded when I bought the boat 3 years ago. I replaced them all and didn't have any other problems with spark until now. I have had intermittent problems where the engine wouldn't kill after running, almost like half the motor shut off but the other half didn't. I replaced most of the ground wires and still couldn't fix the problem so I've been killing it with the choke. However, whil playing around, I found that the mercury switch would kill it just fine. Any help on this would also be great. I now need to replace the trigger, my last fix is not going to survive any longer. Where's the best place to find one? Also, could this be more than a trigger?
Please help.