Wiring Color Codes for Mercury & Mariner Outboard Motors. wiring color codes Here is a listing of common color codes for Mercury and Mariner (US-made) outboard motors. These codes apply to later-model motors (approximately early 80's to present) Mercury Outboard Wiring diagrams -- Mastertech Marin WE HAVE PARTS, SERVICE MANUALS AND WIRING DIAGRAMS AVAILABLE FOR MERCURY OUTBOARD MOTORS : Wondering "Where-'n-'Ell" to get great parts for your outboard? Right Here! A Fun Old Porcelain Sign and Ancient Tools MERCURY WIRING DIAGRAMS. The linked images are printable but may print across more than 1 page (in order to be legible).