Hello all. I need some help. This past spring, I bought my first boat, a 91 Celebrity 180CX. It has a Mercruiser 4.3 V6 I/O. Took the boat out several times this past summer and really enjoyed it. On my second to last trip out, the boat ran fine all day, but after about 6 hours on the lake and starting to head in, it started loosing power. Got it in and changed out the plugs and wires before next outing. On the last trip out, ran boat for about same amount of time and when we started to head in, same issue, only this time it shut down and had to be towed in. Brought it home and started checking possibilities. Boat will not start. No fire from coil. Changed out coil, nothing. Changed out ignition control module, nothing. Pulled wire from dist cap and checked to see if coil would fire, nothing. Checked emergency shutoff switch, and it tests fine. Engine reset button will not engaged, which tells me it hasn't been tripped. Now I'm running out of time and ideas. Need to get boat started to winterize it. Really need guidance.