American Autowire Complete Wiring Harness Classic Update OverviewReviewsOrder a American Autowire Classic Update Kit Complete Wiring Harness for your 1965-1966 Mustang from CJ Pony Parts! This kit gives you everything you need to completely update the wiring in your classic Pony. You can't go wrong with American Autowire!See more on cjponyparts4/5(14)MSRP: $859Brand: American AutowirePrice: $773.1 66 mustang wire harness | eBay Find great deals on eBay for 66 mustang wire harness. Shop with confidence. Skip to main content. eBay Logo: Shop by category. 64 65 66 Ford Mustang Wiring kit Classic Update Wiring Harness Series (Fits: 1966 Mustang) Brand New. $775. Buy It Now. Free Shipping. 27 Watching. Watch.