Hmmm. Could be as simple as a loose battery connection, but I suspect you've checked for that.
Do you have the house battery wired to a fuse block and then the GPS and power trim fed from the fuse block? Wire sizes and lengths?
Low voltage systems are much more sensitive to voltage drop from wire resistance. I was surprised at how big the recommended wire sizes were for pumps and such. I wired most of my circuits with 12 gauge, or 10 gauge wire.
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Blue Heron Boat Works
Reinventing the wheel, one spoke at a time.
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