I'd like to power up my dual GRT Horizon EFIS before engine start. GRT says to use a TCW backup battery although they didn't go into detail how. A friend told me to connect it to a 2nd power input of my EFIS with a switch. He said connect it to my main power batter with a shottkey diode so I can keep it charged with the alternator when not in use.
Anyone have a better explanation or a schematic? What size diode? Connect parallel? Fuse it? All clear as mud to me. Any advice is greatly appreciated.
Anyone have a better explanation or a schematic? What size diode? Connect parallel? Fuse it? All clear as mud to me. Any advice is greatly appreciated.