Another JD 3020 24volt question

Hello all. I just purchased a 1965 JD 3020 diesel standard. SN 79669. It starts fine and came with new batteries. It still has a 24v starter and has a generator. The lights are not working, but have been tested to be alright. I started looking closer and it has 2 batteries in series, but the left is a 6volt and the right is a 12volt. I think someone screwed up in their purchasing. There is no positive or negative grounds which I believe to be the issue with the lights, as there is no 12volt system.
My questions are: do I need both a positive ground on the left battery and a negative ground on the right battery? Should I put a fuse in this system, and where?
I am planning on replacing the 6volt battery with a 12volt.
Also, which is the proper way to put these in series of the 2 photos attached.

I would like to leave this as a 24volt.

Thanks all!
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Since you apparently have a crossover battery cable, the battery wiring shown is the first of the two wiring diagrams is what you have.

There needs to be ONE connection to the chassis at any point (either end) of the battery cable that crosses over and connects the two batteries.

JD parts currently lists a 16-Ga jumper wire, part #R39713 to accomplish this at the LH battery box.

I would make my own from fusible-link wire.
 

Yeh..for the 24V Deere system to work it needs to have two twelve volt batteries wired-up like your schematic.

The lighting system on the 24V system has essentially two systems..a 12V positive grounded system and a 12V negative ground system...

I would check to make for sure somebody hasn't converted it to 12V and that it maybe has a 12V generator on it. The 24V starters can be converted to 12V and maybe that's what you have??

If it's a 24V system there should be two battery cables on the starter...one on the solenoid and one on a lug on the side. A converted starter will just have one cable to the solinoid.

Most guys here will tell you to convert it to a 12V negative ground system..which is definately easier to deal with.
 
Thanks for the reply. The positive cable from the right battery goes to the starter body and the negative from the left goes to the solenoid. Must still be 24volt?
Do the 12volt positive and negative ground circuits both ground from the 'positive' ground off the left battery? I assume since they are connected via the jumper?

Thanks!
 
How can that possibly be working now?? one 6 and one 12? tied together? I would think a boom would be soon coming
 
When I rewired my 4020 a few years back, JD supplied an in line fuse holder with a 20A slow-blow fuse, to be used as the ground. As Bob indicates, this can be placed at either end of the cable connecting the batteries. I placed it at the opposite end of what my picture indicated, as it gave a little easier access.
 

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