It's a Direct Current (DC) not an Alternating Current (AC)
Electric Trolling motors use 12 volt DC or 24 Volt DC Motors don't they? Is there such a thing as a neutral wire in a DC current. I'm not as familiar with AC current but I could swear that is where you get the term neutral, hot and ground wires in the AC current motors.
We need to clear this up for the OP.
To get 24 volts you would probably need two (2) 12 Volt Batteries hooked together to get a total of 24 volts DC current to the trolling motor.
The length of the wire run determines the voltage drop and the larger the wire size the more current it can carry further. My boat was prewired but the wire gage is not that big. I wish I had a heavier duty wire such as a 6 gage wire in my boat as it's almost 16 ft long from stern to bow. My trolling motor is a 12 Volt Minnkota 55 lb thrust motor and it could use some more power. I had to wire in a new hookup when I got the new trolling motor. So I got some heavy duty hook up plugs that are suppose to go with the Minnkota Trolling motor. I had to place a new heavy duty circuit breaking in line with the Red wire as it's the positive wire and the black in the negative in the 12 Volt DC system. I don't have a white wire. I would suspect that maybe (Now I said MAYBE here) the white wire would carry the other 12 volts DC current from another 12 volt battery if you had a two battery system.
Now they either combine in series or parallel and that I can't remember which way give you the 24 volts total. Think of the DC system as a pipe carrying water. The higher the water pressure the more Voltage pushing the water though the pipes. The larger the pipes in ID the more water than can flow though the pipes. And the longer the pipes the more frictions between the water and the inside surface of the pipe. That's the resistance of the water or the currents resistance in this analogy.
[QUOTE=bob46;560892]In electric red and black is hot white is neutral or look at schematic[/QUOTE]