farmall 300 wiring harness | eBay 362669R91 - A New Fuse Wiring Harness For A Farmall 300, 350, 400, 450 Tractors See more like this. 362009R91 - A New Lighting Wiring Harness For A Farmall 300, 350 Gas Tractors. New – Open box. $99. Buy It Now +$15 shipping. Watch. Wiring Harness Farmall 300 - Steiner Tractor Parts Wiring Harness Farmall 300 found in: Restoration Quality Wiring Harness, Wiring Harness Kit (for tractors with 1 wire alternator), 6 to 12 volt Conversion Farmall, Junction Block, Ignition Key Switch w/ 2 Keys & Mounting.