Hi Unless you are fitting a 24 volt starter or somebody has fitted one You shouldn't have that series parallel switch. all those older tractors from what I know had 12v starters and just 2 batteries in originally they were 6v in series, and then somehow they went 12v in parallel to get greater amps. I think that 12/24 system might have come in,during the early to mid mid 80's we started selling new tractors in about 94. The split system was in them, but sold a few used late 80's years with them fitted. The 50 wire runs up to the engage terminal on the starter solenoid. The 50a runs up to the RS 534 starter relay to the terminal marked C. according to my factory wire diagram. the early tractors Have way different wireing and dash boards to the new ones, so that RS 534 might be a RS 502 under the hood by the hydraulic oil tank. on newer tractors it's under the dash board from about 89 on i think I have never converted a 12v system to the 24V so don't know how well this will work, or if at all I just told you the locations of what the wires go to as you asked. So you got to figure it out sadly and hope it's right without a huge pile of problems. Regards Robert
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