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I have the wiring diagrams in my shop manual (not I&T but Deere SM-2039 IIRC) and the changes before cobbling don't look to be necessarily complicated. This shop manual never admits to 12 volts on a diesel or an alternator, though 24 volt alternators are in my pre side console parts book. Later 4020D did go to 12 volts beginning with airconditioned cabs. The pre SN 99,000 wiring harness was all one piece, no connectors. After that the harness was in two or three pieces with connectors at the fire wall, but essentially the same functions. But sometimes the circuit wire insulation color changed at the connector to complicate visual circuit tracing. The way I see the conversion, its essentially connecting the +12 and -12 supplies together to run at + 12 volts, and converting the charging, battery connections, and starter to run between the +12 and ground instead of floating. The batteries can be reconnected, the starter and charger (alternator for performance) have to be replaced. Starters are not rare, and alternators abound from all over the world. There remains a duplication in switch poles, using two poles where a pure 12 volt tractor needs only one, but that's the artifact from having the split system and having to keep the auxiliary loads matched to get the two batteries charged equally. The 10SI I put on my gas 4020 has an extension to the pivot bolt hole that fits between the ears of the generator bracket, but I had to turn the bracket end for end and lengthen the mounting holes to the block to get the pulley to line up. There is a part number for a Deere bracket to take care of all that. Having the Deere shop manual and the parts book in front of you can make the changes most obvious. Gerald J.
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