Ford 1S7Z-12029-AA Coil Assembly - Ignition

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It is very important to check the coil resistance for 1993 and 1994 3.0L V6 engines which have distributor ignition. Disconnect the wires from the coil with ignition turned off and measure resistance by use of an ohmmeter. Primary terminals should be less than 5.0 ohms. Measure resistance between negative primary terminal and secondary terminal, aiming for 10-15K ohms. For replacement, disconnect the battery, primary coil connector, and coil secondary lead. Remove the bracket bolts and detach the coil, then reversal is done when installing it back again. For engines without electronic distributorless ignition, this process is similar. With ignition off, disconnect electrical connector from coil measuring primary resistance below 5.0 ohms. Measure resistance between secondary terminals, considering paired cylinders. Replacement involves disconnecting the battery, ignition coil electrical connector(s), and spark plug wires; remove bolts securing the ignition coil; installation is reverse while making sure spark plug lead is properly coated with Silicone Dielectric on each cylinder's spark plug end.

Connect an ohmmeter between the secondary terminals of the coil and check the resistance. It should be as specified in the specifications.