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KPD,
Here's the scoop from Moyer -- if indeed you have these symptoms...
If the engine shuts down very abruptly, as if someone had inadvertently turned off the ignition:
1. Loss of dependable 12v DC ppower to the positive terminal of the coil. The corrective action is to trace the 12v circuit in the boat's electrical system and repair faulty wires, connections or switches.
The second cause:
Broken lead between the negative terminal of the coil and the points assembly. The corrective actin is to replace the lead.
Here's an added note:
In many cases, loose or corroded terminals build up a small amount of heat during the final moments before failure. Wiothin a short time after failing (usually 15-30 min.) these terminals may again make a good connection after cooling. The engine may then appear to run normally, but seldom for more than an hour or so.
Sounds like your engine was running for four hours, so I don't know if that's the problem. Hope this helps.
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