How to Test Field Coil on a Starter
Testing the field coil on a starter is an essential maintenance task that ensures the proper functioning of the starter motor. The field coil is a crucial component responsible for generating the magnetic field that enables the starter motor to turn the engine over. In this article, we will guide you through the process of testing the field coil on a starter, helping you to identify any issues and take appropriate action.
1. Safety Precautions
Before you begin testing the field coil, it is crucial to take necessary safety precautions. Ensure that the engine is turned off and the vehicle is parked on a level surface. Disconnect the battery to prevent any accidental short circuits. Wear appropriate safety gear, such as gloves and eye protection, to protect yourself from potential hazards.
2. Locate the Field Coil
The field coil is typically located on the back of the starter motor. It is a solenoid coil connected to the battery through two terminals. Locate the field coil by examining the starter motor’s exterior. The field coil is usually marked with a label or can be identified by its shape and location.
3. Disconnect the Battery
Once you have located the field coil, disconnect the battery to prevent any electrical shocks. Use a wrench to loosen the battery terminal nuts and disconnect the negative terminal first. This ensures that any residual voltage is discharged before proceeding with the test.
4. Check the Field Coil Resistance
To test the field coil, you will need a multimeter. Set the multimeter to the ohms (Ω) setting. Connect the red probe to the positive terminal of the field coil and the black probe to the negative terminal. The resistance reading should be within the manufacturer’s specified range. If the resistance is too high or too low, it indicates a problem with the field coil.
5. Test the Field Coil Current
If the resistance test is within the acceptable range, proceed to test the field coil current. Connect the red probe of the multimeter to the positive terminal of the field coil and the black probe to the negative terminal of the battery. The current reading should be within the manufacturer’s specified range. If the current is too high or too low, it suggests a malfunctioning field coil.
6. Inspect the Field Coil for Physical Damage
If the resistance and current tests are within the acceptable ranges, inspect the field coil for any physical damage. Look for signs of corrosion, cracks, or any other visible defects. If any damage is found, the field coil may need to be replaced.
7. Reconnect the Battery and Reassemble
Once you have completed the testing and inspection, reconnect the battery and reassemble the starter motor. Ensure that all connections are secure and tight.
Conclusion
Testing the field coil on a starter is an important task that helps maintain the functionality of your vehicle’s starter motor. By following the steps outlined in this article, you can effectively test the field coil and identify any potential issues. Remember to prioritize safety and consult the vehicle’s repair manual for specific instructions and specifications.
