Mercury Outboard Wiring Diagram | Free Wiring Diagram Collection of mercury outboard wiring diagram. A wiring diagram is a streamlined traditional photographic depiction of an electric circuit. It reveals the parts of the circuit as simplified shapes, as well as the power and also signal connections between the devices. Mercury Outboard Wiring diagrams -- Mastertech Marin Please review our Warranty, Returns & Refunds policies before you place an order. DISCLAIMER. The information provided on these pages is correct to the best of my knowledge, however the MasterTech makes no warranty, express or implied, regarding the use of, results of, or liability created from, application of this data.