[header] How to replace your mercruiser spark plug wires [title] Read your manual and all the safety tips. [title] Read all warnings about fuel, fuel vapors and dangerous moving parts. [title] Understand that you are working with explosive vapors and sparks so extreme caution must be taken to avoid explosion and or fire. 
[title] Determine your engine rotation (see tips). [title] Write down your firing order for your model engine.