Mercury 3L3Z-12029-BA Coil Assembly - Ignition

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To check the EI ignition system, disconnect the coil's electrical connector(s) with the ignition off and use an ohmmeter to measure resistance. If not, replace the coil. For this, disconnect the battery's negative cable, the ignition coil electrical connector(s), and remove the spark plug wires. Remove the ignition coil from the engine mounting bracket. During installation, apply silicone dielectric compound inside the rubber boot before inserting each spark plug wire into the ignition coil.

First of all, apply the silicone dielectric compound inside each boot after detaching a spark plug wire. Replace and check for spark plug wires while you're installing new spark plugs. First off, watch for damage to the wires as the engine runs, starting with cylinder number one. The other wires should be inspected and made sure they are well fastened. Also, clean them up and see if there are any cracks on the coil packs or carbon tracking problems.

Yes, this procedure applies to all ignition coils.

If any damage is found, the coil should be replaced.

After cleaning the wire, check for burns, cracks, and other damage.

To check the electronic integrated (El) ignition system with the coil over plug (COP) system, start by disconnecting the electrical connector(s) from each coil assembly with the ignition off. Use an ohmmeter to measure the resistance between the coil primary terminal (+) and the negative terminal (-). The resistance should match the specifications listed. Next, remove the COP assembly from the cylinder head and connect the ohmmeter between the secondary terminals, which fit over the spark plug. Again, the resistance should match the specifications. If the resistance is not correct, the coil should be replaced.

Replace the coil.

Installation is the reverse of removal.

Each coil has a output of 12V

Yes, this part number is just the ignition coil itself