Read your manual and all the safety tips.
Read all warnings about fuel, fuel vapors and dangerous moving parts.
Understand that you are working with explosive vapors and sparks so extreme caution must be taken to avoid explosion and or fire.
Determine your engine rotation (see tips).
Write down your firing order for your model engine. This information will be listed in your factory Mercruiser Service Manual.
Get familiar with your cylinder numbering system. GM engines do not have the same cylinder number layout as Ford engines.
Label each cylinder position such as #1, #2, #3, etc.
Make sure all your spark plugs are the correct type and that they have been properly installed and tightened.
Lay out each spark plug wire in order of length.
Plan ahead so you know which plug wire will reach which cylinder.
Only install good clean spark plug wires.
Determine your distributor rotor rotation.
Label each distributor plug wire pole with White-Out if not already labeled from the factory.
Refer to your firing order to properly label the distributor cap poles.
Double check that you have the cap properly labeled as this is where many people get confused.
Locate the #1 spark plug wire pole on your distributor cap. Your manual can help you ID which pole is #1.
Install the #1 plug wire to the #1 pole and neatly run the plug wire down to the #1 spark plug.
Make sure the plug wire snaps firmly onto the spark plug.
Select the correct length wire for the next cylinder number in the firing order and install it.
Install each and every plug wire one at a time double checking it's position in the firing order on the cap and on the spark plug.
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