New Holland 19742: Main Relay Opens Too Early or Too Late

The main relay opens prematurely or delays in closing, causing the main relay to turn off before the EEPROM update is completed. This issue is related to an open circuit in the power relay control circuit.

1. 1

   Main relay operation

2. 2

   Power relay control circuit

3. 3

   ECM/PCM wiring and connections

1. 1

   Inspect

   Inspect the main relay for signs of damage or wear.

2. 2

   Test

   Test the power relay control circuit for continuity and proper voltage.

3. 3

   Check

   Check the connections to the ECM/PCM for looseness, corrosion, or damage.