New Holland 19740: Main Relay Opens Too Early or Too Late

The main relay is not functioning correctly, either opening too early or too late, which may be caused by a short circuit or an open circuit in the relay control circuit. This issue affects the operation of the main relay controlled by the ECM/PCM.

1. 1

   Main relay

2. 2

   ECM/PCM relay control circuit

3. 3

   Wiring associated with the main relay

1. 1

   Inspect

   Inspect the main relay for signs of damage, wear, or short circuit.

2. 2

   Test

   Test the ECM/PCM relay control circuit for continuity and proper voltage.

3. 3

   Check

   Check the wiring and connections related to the main relay for any open circuits or damage.