[PDF] 1989 WIRING DIAGRAMS R-V, P TRUCK MODELS 1989 WIRING DIAGRAMS R-V, P TRUCK MODELS When reference is made in this manual to a brand name, number, or specific tool, an equivalent product may prior written permission of the GMC Truck Division of General Motors Corp. This includes all text, illustrations, tables and charts. The circuit load can be one light or many lights in 1989 gmc sierra tail lights | eBay Find great deals on eBay for 1989 gmc sierra tail lights. Shop with confidence. Skip to main content. eBay Logo: Shop by category. Shop by category. Fit 88-98 C/K C10 GMC Sierra Suburban Pickup Truck Dark Red Tail Light Lamps (Fits: 1989 GMC Sierra) Brand New. 5.0 out of 5 stars.