Porsche 944 turbo wiring harness | eBay Find great deals on eBay for Porsche 944 turbo wiring harness. Shop with confidence. Skip to main content. eBay Logo: Shop by category. Porsche 944 Turbo S2 Headlight Headlamp Wire Head Light Lamp Wiring Harness Loom. Pre-Owned. $19. From APO/FPO. Buy It 944 Headlight Relay Harness - Rennbay The Rennbay Headlight Relay Harness replaces the main wiring run to both headlights. It takes the electrical load off of the stock wiring and passes it via a set of high amperage relays. The problem with the stock headlight wiring is that with age it has built up much more resistance than when it was first installed at the factory.