I have a 1990 25 HP Mercury (0C26XXXX) that I need some help with. It is only firing on the top cylinder. Switched the wires on the coils as recommended here and the other coil fired the top cylinder as well. Coils are good.
Built a DVA to check voltages. Stator voltages and resistance appear to be fine. Trigger voltages did not register. Switched the trigger wires so that the brown/yellow wires went to brown/white wires on the switch box and the bottom cylinder got spark for the first time! Great ? I figured it must be the trigger. Had 2 triggers laying around and installed them on the engine. Neither worked. Spark only on the top cylinder ? ARRGH?
So I would like to hear what you think I should test for next. Or ? do you think I need to just replace the switch box?
Would appreciate any help ? would love to be on the water this year? Thanks! John
Built a DVA to check voltages. Stator voltages and resistance appear to be fine. Trigger voltages did not register. Switched the trigger wires so that the brown/yellow wires went to brown/white wires on the switch box and the bottom cylinder got spark for the first time! Great ? I figured it must be the trigger. Had 2 triggers laying around and installed them on the engine. Neither worked. Spark only on the top cylinder ? ARRGH?
So I would like to hear what you think I should test for next. Or ? do you think I need to just replace the switch box?
Would appreciate any help ? would love to be on the water this year? Thanks! John