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The alt. issue still bothers me. Did you continue to wire harness search for the junction?While the alt. takes a throttle bump once battery voltage drops below to begin charging there was no substantial voltage drop like when the cannon plug is connected and the engine is being supplied power via the dash.
Could the high resistance in the alt. wire explain the delayed charge when the voltage is low? [/QUOTE It is my thought the resistance is interfering w/the excitation voltage to the alternator...maybe I'm wrong. I had a 1987 Baretta that had wiring problems from corrosion. I gave in and replaced all of the boat wiring and half of the engine wiring to solve the problem. The blower acted the same as yours does. I replaced it w/a lower amperage high volume 4" blower. That solved that issue. It required a 4" air duct and new air exhaust plenum.
If you don't use tinned wire as a replacement be sure to at least tin the stripped ends of the new wire w/solder before connecting them. If you don't know how to tin the wire ends check youtube for soldering electrical wires. All you need is rosin core or solid solder, flux and a solder gun all of which are available at most hardware stores. Don't use acid core solder.
Maybe order a new harness from the big connector back to the dash..........start NEW!! QUOTE]
As I suggested before........running a seperate wire leaves your boat in a state that ONLY you know what the wire is for and if someone else ever has to troubleshoot it may be at a loss.........................