Look carefully at the existing wiring
- behind the walls. It is common in older boats for the previous owner to have made numerous "convenience" hook-ups and bypasses fixing problems rather than really doing it the right way.
- - I have never had any luck with 12VDC TV's and they seem to cost more than buying
a discount store LCD TV/Monitor plus a small inverter to supply it 120VAC off the batteries. Then you can play DVD's on your computer and watch them on the "big" screen
- - I hope your meant 100 "amp" alternator
and not 100 "watt" alternator. There is a world of difference.