New Holland 19739: Main Relay Opens Too Early or Too Late

The main relay is not operating at the correct time, either opening too early or disconnecting too late. This can cause improper power distribution to the control circuit of the ECM/PCM, leading to potential system malfunctions.

1. 1

   Main relay operation timing

2. 2

   Relay power circuit to ECM/PCM

3. 3

   Control circuit connections

1. 1

   Inspect

   Inspect the main relay for signs of wear, damage, or improper seating.

2. 2

   Test

   Test the timing of the main relay operation using a diagnostic tool or oscilloscope.

3. 3

   Check

   Check the connections and wiring in the relay power circuit to the ECM/PCM for any faults.