''A + wire connected to each of the + terminals and spliced together into 1 wire?''
That's going too make a nasty spark and let lots of smoke out of the wiring if actually connected as you are thinking!
Have you tried running the marker control on the RH battery and verified if uneven discharge would actually be a problem?
(ASSUMING the batteries are wired correctly/as they were when the tractor left the factory.)
(Depends upon how much power the marker control actually uses.)
One ''workaround'' ''back in the day'' was to use alligator clips on the control box power wires and switching between batteries every so many hours of use.
Doing that depends upon if the negative power wire is connected to the chassis of the marker control.
If it IS and the box is mounted/grounded to the tractor you CANNOT power it from the LH battery. (Again ASSUMING the tractor is wired ''as original.)
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Today's Featured Article - Product Review: Black Tire Paint - by Staff. I have been fortunate in that two of my tractors have had rear tires that were in great shape when I bought the tractor. My model "H" even had the old style fronts with plenty of tread. My "L" fronts were mismatched Sears Guardsman snow tires, which I promptly tossed. Well, although these tires were in good shape as far as tread was concerned, they looked real sad. All were flat, but new tubes fixed that. In addition to years and years of scuffing and fading, they had paint splattered on
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