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Testing Ignition Coils on the Mercury 250 Pro XS Optimax Outboard Motor Part 2 #boatlife #boating

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First published at 04:54 UTC on November 14th, 2023.

HawkeyeMarine

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Testing the ignition coil and spark plug wires on a Mercury 225 Proxs Optimax outboard. These have a 5 pin connector for the ignition coil. This will be the same for any 5 pin ignition coil Optimax outboards by Mercury.

Testing the ignition coi…

Testing the ignition coils on a Mercury 250 Pro XS Optimax outboard motor is an essential part of diagnosing and troubleshooting ignition system issues. If you suspect a problem with the ignition coils, you can follow these steps to test them:

Note: Before you begin testing, ensure that the ignition is off, and the battery is disconnected to prevent any accidental starts.

Tools and Equipment Needed:

Multimeter (digital or analog)
Socket set or wrenches
Spark plug socket and spark plug gap tool
Step 1: Safety Precautions

Ensure that the outboard motor is in neutral and the emergency stop switch is pulled out to disable the ignition.
Disconnect the battery to prevent electrical shocks or accidental engine starts.
Step 2: Locate the Ignition Coils

On the Mercury 250 Pro XS Optimax, the ignition coils are typically located on top of the cylinder head or cylinder block near the spark plugs. You may need to remove any covers or components to access them.
Step 3: Remove Spark Plugs

Use a spark plug socket and wrench to remove the spark plugs from the cylinders. This will make it easier to test the ignition coils.
Step 4: Test the Primary Circuit

Set your multimeter to the ohms (Ω) setting.
Connect one probe to the positive terminal of the ignition coil and the other probe to the negative terminal. You should read a low resistance value, typically around 0.5 to 3 ohms, depending on the specific coil.
If the resistance is significantly higher or lower than the expected range, it may indicate a problem with the coil's primary winding, and the coil may need replacement.
Step 5: Test the Secondary Circuit

Set your multimeter to the kilo-ohms (kΩ) setting.
Connect one probe to the center terminal of the ignition coil (where the spark plug wire conn..

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