Jeep Wiring Harness | eBay A Jeep engine wiring harness will have connections and cables made specifically to fit your vehicle, whether that's a Jeep Wrangler or Grand Cherokee; you cannot use a wiring harness from another vehicle with your engine. Turn to reliable sellers on eBay to find the correct wiring harness for your Jeep. jeep tj engine wiring harness | eBay Find great deals on eBay for jeep tj engine wiring harness. Shop with confidence. Skip to main content. eBay Logo: Shop by category. Shop by category. Enter your search keyword 1998 Jeep Wrangler TJ Engine Wiring Harness 4.0 5spd. Pre-Owned. $145. or Best Offer +$9 shipping.