1999 Honda FourTrax 300 TRX300 WIRE HARNESS Parts - BikeBandit To tackle tough trails, your Honda FourTrax’s engine needs the right spark at the right time. If your 1999 Honda FourTrax 300 TRX300 wire harness has seen better days, choose BikeBandit for OEM and aftermarket parts from the leading manufacturers in the ATV parts industry, including QuadBoss, Moose Racing and Honda.4.7/5(6) honda 300ex wiring harness | eBay Find great deals on eBay for honda 300ex wiring harness. Shop with confidence. Skip to main content. eBay Logo: 1994 HONDA 300 EX WIRING HARNESS PARTS ONLY . Pre-Owned. $65. or Best Offer. Free Shipping. BB2 MAIN WIRING HARNESS LOOM CUTS DAMAGED 00 HONDA TRX 300 EX TRX300 FREE SHIP. Parts Only.