Hi, me again. The wiring diagram in the service manual should tell you what size wiring was originally used. If you can't find actual sizes, here are some general guidelines that should work OK. I tend to err on the conservative side since the difference in cost for the next size wire is negligible. You can always use a larger wire size, just don't go any smaller. The only problem with using all larger sizes is getting small lugs to fit big wire, and its hard to fit into tight places sometimes.
Charging circuit (generator to regulator to ammeter to battery): AWG 10 or 12
Headlights: AWG 12 or 14
Tailights: AWG 14 or 16
Ignition circuit & gauges (except charging circuit through ammeter) AWG 16 or 18
Crimp type terminals are available at any auto parts store. Spend the extra money & get good quality ones; I've never had good luck with the junk that places like Harbor Freight & WalMart sell.
I also prefer to solder the crimp and cover it with shrink tubing, particularly on something like a tractor that's exposed to the weather. It takes a little more time, but makes a much sturdier & longer lasting connection.
NAPA also sells wire loom material. If you're really into originality, places that cater to auto restoration sell cloth covered wire. I've never tried to buy a pre-made harness, so can't tell you where to try for that route.
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