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Are you talking about the ignition coils on your Mariner/Mercury? You can get an inline tester for like $5 at most auto parts shops. Or there's always Harbor Fright. Or were you talking about the stator or trigger coils?
5$ coil tester, post us a link.
What other coils are there on an outboard?
 

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5$ coil tester, post us a link.
What other coils are there on an outboard?
Just an inline spark tester is what I use to tell if the coil is good and the plug is getting the pulse. HF has them in multiple configurations. One end accepts the plug wire terminal and the other goes to the plug. Crank the engine and look for the neon bulb to fire. Its what I use and is better than just firing the ignition onto zero load which can cause failure at the coil.

Other coils on an outboard engine? Lets see... Stator coil(s) can be multiples depending on engine, trigger coil, etc, etc. All are part of the ignition system on a Merc/Mariner so when the OP says "spark" it could mean any of these.

 

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Here is how to test coil with a multimeter the guy is a little on the talkative side, but he has the correct info eventually

 
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