Basic wiring 101

[scenarioL113]

I want to go thru my wiring on my boat and it is satisfactory. Since I have converted to diesel I need to make my own harness for the engines, since the engines did not come with them.

I have harnesses coming from my flybridge and have all of them labeled for their respective functions.

I know the ignition "on" will go to the fuel cut-off solenoid

The "cranking" wire will go to the starter solenoid

my oil pressure and water temperature senders are no prob either.


What about the alternator?

will a wire go directly to the battery?

what will connect to the voltage gauge? from what?