ok
in case anyone else runs into this.
for the humminbird 787c2 gps portion of the unit (as far as i can tell)
white = nema out +
black = nema out -
red = no idea... maybe to power your vhf from the gps unit??
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ICOM302
green = nema - in
yellow = nema + in
Turn on nema in gps menu on humminbird and vhf
other questions still on the table
