The Mega 360 power along with all my electronics are on a dedicated separate 125 Lithium battery. Then drain and ground are attached. Verified with an ohm meter the integrity of all wires back to ground and power. I had a previous Mega 360 mounted that the screws did not rust but I pinched the wires on the transducer cable, so the original was replaced, and now the new Mega 360 is rusting the screws. Just for the sake of making sure I re did the connection to the ground and the drains and power.
I have been running a dedicated battery setup for several years and this is the first issue with rusting screws.
Anything else I can check or do