ford engine wiring harness | eBay Find great deals on eBay for ford engine wiring harness. Shop with confidence. Skip to main content. eBay Logo: Ford Mustang 3 V6 Engine Wire Wiring Harness 2015 2016 2017 @ See more like this. 2004 Ford Super Duty F350 6.0 Powerstroke Main Engine Wiring Harness. Pre-Owned. $199. 1967 Mustang Wiring and Vacuum Diagrams - Average Joe How do i install a neutral safety switch to a 1967 mustang coupe, with a c-4 transmission. mike mendez — April 21, 2011 8:09 PM . The neutral safety switch is located in the driver side of the transmission and is pretty easy to remove and replace.