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

The main relay is not operating at the correct time, either opening too early or too late. This can affect the proper functioning of the electrical system. A short circuit in the main relay may also be present.

1. 1

   Main Relay

2. 2

   Main Relay Short Circuit

3. 3

   ECM/PCM Power Relay Control Circuit

1. 1

   Inspect

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

2. 2

   Test

   Test the main relay to determine if it is opening at the correct time.

3. 3

   Check

   Check the ECM/PCM Power Relay Control Circuit for any issues.