2018 Fiat 500 Curt T-Connector Vehicle Wiring Harness with 2018 Fiat 500 - Curt T-Connector Vehicle Wiring Harness with 4-Pole Flat Trailer Connector. Quickly and easily install a 4-way trailer connector on your Fiat 500 with this custom harness. T-connector plugs directly into existing wiring. Powered converter reduces strain on wiring system and is made using SMT to ensure superior performance. Features:4.7/5(7)Category: Custom Fit Vehicle Wiring fiat 500 harness | eBay Find great deals on eBay for fiat 500 harness. Shop with confidence. Skip to main content. eBay Logo: 1 product rating - ⭐ 12 13 Fiat 500 Engine Wiring Harness 68140275AC Sku P11-8 ENGINE WIRE HARNESS FITS 2014 FIAT 500 4 DOOR 1 MT 31610 See more like this. Wire Harness Body FIAT 500 14. Pre-Owned.