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An antique boat with a single battery and 2 plastic tanks depends on the motor "ground", as an electrical "drain" (ground)....
the only connection on the fuel reservoir is the fuel line...and that leaves me with 24 gallons of explosive gasoline nestled between my legs...comforting....!
I'm just making sure there's a heavy,( 10Ga.) hot and Ground coming off the battery to the console to a breaker panel, that I can then send out to the various dependents...audio, instruments, lighting.....and shut 'em down when at rest....
The automatic bilge gets tied direct...
There's not much else to it in my old bathtub...