Farmall Tractor Wiring Harness - Yesterday's Tractors Farmall Wiring Harness Kit - This Wiring Harness Kit is for tractors using 4 terminal voltage regulators. Please note: The cutout will have 2 terminals on one side and one terminal on another. A regulator will have 3 terminals on one side and one terminal on the other side or on the bottom. farmall super a wiring harness | eBay Save farmall super a wiring harness to get e-mail alerts and updates on your eBay Feed. + Items in search results. SPONSORED. FARMALL WIRING HARNESS. PART# 354231R92.SUPER A & A-1 LIGHTS REGULATOR. FARMALL HEADLIGHT WIRING HARNESS SUPER H, HV, SUPER M, MTA. HAS GROUND WIRES. Brand New. $32. Buy It Now +$4 shipping. 53 Watching.