Well the diode is stabilizing the
electrical system. I’d understand the whole system before I removed it.
If you charge a battery over the
winter and attached a small lightbulb to it to keep it active and the lightbulb blew a diode would protect it somewhat. The inventions to add
solar panels to boats I’m assuming.
Or any wind or
water generator.
Most of us leave the fridge on or a TV transformer plugged in to create draw.
Using excess energy is huge.
Toronto set a First by taking wasted night time energy sent to earth to a
pump station on Toronto Island. The pumps fill
tanks under the lake with compressed air which runs turbines on shore disguised as large art blobs. All cities consume same amount of
power day or night. It’s just at night we send the excess to earth.
These balancing coils are huge to control the night time excess.
So yes putting excess charge to ground from
shore power or other should be controlled by a modern
charging system.
Bad systems can make the marina water dangerous.
Who ever made that diode
work knows way more than you or I.
I’d suggest you start fresh at the
charging system check up.