1988 Ford F-350 OE Wiring Harnesses & Stereo Adapters Ford F-350 1988, Factory Replacement Wiring Harness by Scosche®, with OEM Radio Plug and Provides 4 Speaker Connectors. Up yourself and your tunes over the factory installation with top-of-the-line audio products from Scosche. Ford F350 Engine Wiring Harness - AutoZone Order Ford F350 Engine Wiring Harness online today. Free Same Day Store Pickup. Check out free battery charging and engine diagnostic testing while you are in store.