The center point of the two 12 Volt batteries connected in series is supposed to be connected to the chassis.
That gives you a source of 12 Volts (+) at the post on the starter "belly" facing the engine block, and 12 Volts(-) at the top terminal on the starter solenoid. (This is with respect to the chassis "ground".)
They used a 2 circuit light switch, the voltage from those points at the starter was brought up to the light switch though several connectors and breakers.
Roughly half of the lights are fed from the (+) half of the switch and the other half from the (-) side of the switch, evening the load on the two batteries.
If things have been changed around (all the lights fed by one battery, for example) it doesn't work out very well.
Check it out and post back with any questions. Probably will get the most help if you post at the DEERE-specific Board lower down on the page.
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