Going thru the boat and knew when I bought it last week it had a few minor issues. Transducer cracked so while looking at it noticed paint chipping off and what looks to be electrolysis just under the jackplate. Agree? Probably a bad ground? Solutions for a shortcut to finding it?

That almost looks like the piece of metal they put on to GATHER the electrolysis. hard to tell from your pics if it is actually part of your jack plate.

Sacrificial anode. Draws corrosion to itself instead of to the outboard.

^^ what he said^^ anode

Shoulda just called you Dennis!