Opel GT Wiring Harness - New Vintage Auto Opel GT Wiring Harness. Now available in the US are these Opel GT Wiring Harnesses for 1968-1973 year models. All made in the US using an upgraded powdercoated steel fuse box, color correct coded TXL wire with OE terminals. Year specific, and upgrades available, these are made to order, so please allow 2-3 weeks for shipment. ELECTRICAL [WIRING HARNESS] OPEL VECTRA-C electrical [wiring harness] opel vectra-c. not used with electric sun roof. aerial harness. used with electric sun roof. aerial harness. air conditioning harness. axle speed sensor harness. hatch (f68) (lhd) (-38047797) body wiring harness. saloon (f69) (lhd) (-31070293) body wiring harness.