farmall wiring harness | eBay www›Search›farmall wiring harnessFind great deals on eBay for farmall wiring harness. Shop with confidence. Skip to main content. eBay Logo: Farmall 300 Tractor Wiring Harness - 6 Harnesses Included . Brand New. $210. Buy It Now. Free Shipping. Front Main Wiring Harness for Farmall 656 Diesel Ser#23109 & Farmall 300 Wiring Harness, Main - 362019R91 wwwerdaystractors››Farmall›300›Electrical SystemInternational Harvester / Farmall 300 Wiring Harness, Main for sale, 362019R91. Reproduction of original with cloth covered laquered wire and cotton braid. For tractor models 300, 350 both with gas engines. for sale.