Mercury Outboard Service Manual Free Download PDF - Boat Being a leader is the philosophy of Mercury Marine. Each Mercury boat engine is a combination of speed I'm looking for a wiring diagram for a Mercury 75 HP 4 stroke S/N:0G982237 Production Year 2007 Thank you. #6. Francis Coppage (Wednesday, 17 July 2019 03:50) Looking for a wiring diagram for a Merc 200 20HP S/N:2553511 Production Year How To Wire A Boat | Beginners Guide With Diagrams | New It’s pretty standard in boat wiring to bypass the main battery switch for one thing: The boat’s bilge pump float switch. This way, even if your battery switch is off, if your boat starts filling with water the pump will still kick on. I’d rather have a dead battery than a swamped boat.