Posted by wore out on April 30, 2020 at 22:10:54 from (64.255.159.199):
The midpoint of the two batteries is connected to the chassis.
As it left the factory, the RH battery supplies (+) 12 volts to the terminal on the engine block side of the starter "belly", the LH battery supplies (-) 12 Volts to the upper post on the starter solenoid.
The (+) 12 Volts and the (-) 12 Volts are "seen" by the starter and generator as 24 Volts.
From the battery connections at the starter, the wiring harness takes (+) 12 Volts and (-) 12 Volts to the light switch, by way of the key switch and a pair of circuit breakers.
The light switch is two switches in one, it runs half the lights (more or less) from the "BATT A" (+) 12 Volt supply (brown wire), and the other half (more or less) from the "BATT B" (-) 12 Volt supply (blue wire).
NOTE the path of the brown and blue wires and what they are connected to, that is the secret to how all this works... operating 12 Volt lights on a system that charges at 24 Volts.
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