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Thanks to both of you for the responses. As usual, though, nothing is simple. As I said, this is pretty much a stock 4020 LP. The only kicker I can see in doing a conversion to a negative ground, which certainly would make life easier, is the one non-stock attachment I've found in the electrical system: It has a device wired into the ignition system that I assume is a spark enhancer. This device is a "Hilco Model P". It is a couple of coils, some heat dissipating fins and it looks like a small solid-state module. One wire from it runs to the engine block (ground), 1 wire goes to the (-) terminal on the coil, and one wire goes into the distributor. Before I switch polarity on this tractor I would like to make sure of what I'm doing with this Hilco device. The tractor runs better than it should for being almost 40 years old. It starts at -20, runs well under full load all summer, etc., etc. Part of this reason for that, I believe, is this Hilco thing. The reason I'm considering converting to an alternator is that I've added electrical load over the last couple of years: in-cab heat, more lights for night work, cab fans, etc. I suspect that if a number of them are operating, I exceed the generator's output, but I don't want to sacrifice the performance I'm getting from the tractor now. Anyone have any ideas on how to deal with this Hilco 3rd party ignition deal if I switch the tractor to a negative ground system?
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