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Like you say, this engine puts a pretty good constant load on the battery, especially when shifted into neutral or reverse. It is usually just loose battery/cable connections that create voltage spikes that might harm the amplifier. I have never heard of any overcharging problems with this system on the battery CD engines, or experienced a damaged stator winding. Later model mag CD engines that put no load on the battery were subject to overcharging problems.
I would be interested in seeing the manual describing the more sophisticated system, and read the reports of overcharging on battery CD equipped engines.
The alternator system is really simple on this engine, the only confusing part are the shift diodes plumbed into the alternator to keep the engine in neutral while the flywheel is spinning with the key turned off…