mercruiser inboard ignition wiring Page: 1 - iboats Re: mercruiser inboard ignition wiring Reply to Captian,and anyone else with ideas! i will check the ignition switch to see if it pushes in, if i need to change it out where will the orange wire go in a three prong setting. MSD Ready To Run Distributor Installation - YouTube Click to view on Bing16:26I had a slight stumble on acceleration and I had previously changed the spark plugs, ignition module, ohmed the spark plug wires, changed to another known good coil, fuel filter and disassembled the carb to clean it. I ordered a Author: AveRage JoeViews: 16K Mercruiser 3 Engine Wiring Diagram | PerfProTech Mercruiser 3 Engine Wiring Diagrams. A – Ignition Components 1 – Distributor 2 – Ignition Coil 3 – Shift Cutout Switch. B – Starting Charging and Choke Components 1 – Alternator 2 – Electric Choke 3 – Ground Stud 4 – Starter Motor 5 – Starter Slave Solenoid.