Think I’m good to go now, thank you for all the folks that gave advice.
Powered everything up for test run, have less than 2% drop everywhere.
More like 1 1/2%. I took a whole bunch of length out of my circuits, heavier wire, eliminated a handful of splices, and bypassed my factory dash switches and fuse block. I think that was a major part of my problem, boat is 23 years old, and even new I don’t think they imagined the kind of load I have now. But everything is cut off with my main battery disconnect, and fused within a few inches of the battery connection.


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