Re: boat head unit install
for the deck to power up all you should need is the black wire grounded, and the red and yellow wire to +12v. for boats i always install or use an existing switch for the red wire, and if you don't use the boat for long periods of time and you don't want to deck drawing any power from the battery, then put the yellow and red wire on a switch.
4x 12" HDC3's
1x Hifonics Maxximus (rated 10,000@1ohm)
2x Powermaster D3100
8x runs of 0 gauge
1x stock alt
155.2 dB legal (vehicle off and @50Hz) in a Ford exploder