fiat spider wiring harness | eBay FIAT 124 SPIDER 76 WIRING HARNESS. Pre-Owned. $75. Was: Previous Price $89. or Best Offer. Free Shipping. 15% off. Nice Used OEM Fiat/Pinninfarina 2000 Spider Trunk/Taillamp/BackUp Wiring Harness. Pre-Owned. $49. or Best Offer +$12 shipping. 2017 FIAT 124 SPIDER ABARTH OEM INTERIOR REAR CHASSIS BODY WIRE WIRING HARNESS.[PDF] Installing the Painless #10102 Harness in an early Fiat Spider Installing the Painless #10102 Harness in an early Fiat Spider Many reliability complaints about the Fiat Spider relate to electrics. Most of these complaints can be attributed to shoddy repairs/modifications at the hands of previous owners.