Join Date: Sep 2018
Location: Cape Elizabeth, Maine
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Found the wiring diagram (page 22 of your manual) and I can see that the white wire indeed does go to the float jack and has a diode in line to prevent self-discharge, and also goes back to the key switch. I see an 8A fuse in line there, as well.
Looks like the white wire carries the +12V to the key switch, which then sends it back out the B/W wire to the solenoid to fire the starter motor, which gets its +12V via the red cable.