Genuine Ford Ranger Ignition Coil

Ford Ranger Ignition Coil Parts Questions & Answers

• Coil Assembly - Ignition
  1F2Z-12029-AC
  Q: How to check the primary and secondary resistance of a coil and replace it on 2000-2011 Ford Ranger?

  A: To check a coil's primary resistance, disconnect the coil's electrical connector and use an ohmmeter across the primary terminals. The resistance should be under 5.0 ohms. If it's a high or open circuit, the coil might be faulty. To replace the coil, disconnect the battery's negative cable, the ignition coil connector(s), and spark plug wires. Remove the coil's securing bolts and install the new coil. Coat the rubber boot interior with Silicone Dielectric Compound and insert the spark plug wires into the terminals. Reinstall the radio ignition interference capacitor if needed.
• Coil Assembly - Ignition
  1S7Z-12029-AA
  Q: How to check and replace the ignition coil on a 1993-2011 Ford Ranger with a distributor ignition system?

  A: 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.