ELECTRICAL - Wiring Looms - VW parts Browse Wiring Looms Products. Description: GROMMET, HEADLIGHT HARNESS THRU TRUNK BUG / GHIA 1952-60 OR MAIN HARNESS THRU FIREWALL BUG 1946-66, GHIA 1956-67, BUS 1950-64 Item #: 113-907. Condition: New. In Stock. Price WIRING HARNESS, BUG 1966 (Includes Wire Grommets For: Dash Harness, Heater Channel, Tail Light, Horn & Brake Replace “Main” Wiring Harness – 1966 VW Beetle Project Mar 28, 2012Replace “Main” Wiring Harness – 1966 VW Beetle Project. Leave a reply. I replaced the “main” wiring harness today. The wiring harness that was in the car got some over-paint on it while I was doing the undercoating of the car last summer.