1951 ford wire harness | eBay Find great deals on eBay for 1951 ford wire harness. Shop with confidence. Skip to main content. eBay Logo: Main Engine Wiring Harness 1951 Ford Car 8 cylinder with turn signals See more like this. Rebel Wire 12 Volt Wiring Harness, 9+3 Circuit Universal Kit, Made in the USA!! (Fits: 1951 Wiring Harness, 6 Volt To 12 Volt Conversion or 12 Volt Weighs 10lbs. This is a custom wiring harness to convert your stock 6V engine to 12 Volts! If you want a very simple way to upgrade to 12 volts for reliability, you will be thrilled with this product.