Re: 1984 200hp black max problems
A bad rectifier will not cause overvoltage, period.
That vintage v6 would have a 16 amp system, which had a shunt type regulator that sometimes worked, sometimes smoked, and is not useful enough to bother replacing. In fact if it's still there, discard it before it smokes and starts an engine fire. Without regulation, the system will try to put out about 90 volts at WOT, but will be limited to about 16 amperes by the mechanical design of the stator and flywheel.
Assuming you use some power for trim, the oil alert, instruments, etc, a good battery will hold down the output of a 16 amp system to specifications. The caveat is that the battery needs to be maintained, especially the water level, because it will use some. Battery cables need to be good, clean, and tight.
Overvoltage indicates that the battery or battery cables need maintenance.
Now I'll cut to the chase.
You need to discern if the problem is ignition or fuel. Systematic troubleshooting is the best, and easiest way to avoid buying expensive parts you don't need.
If it's fuel, there are ways to discern if it's delivery or carburetion, then what component is the trouble. One thing that often happens these days is the alcohol in the fuel causes the inside of the fuel lines to disintegrate. The resulting debris plugs up fuel filters, pumps, and carbs. It is worth while to check into it, and also to try to run only non-alcohol fuel.
If it's electrical, it's a system, with a lot of parts. Going through the tests with a maintenance manual and a DVA peak reading voltmeter should take you immediately to the failing part. It could be anything from a faulty tilt or kill switch to switchboxes to a stator to coils to a trigger to all of the above.
One thing you need to know. Unless it totally takes out the stator, the battery charging system will not affect the ignition system. They are completely separate.
hope it helps
John
