Case IH 520579-00 - BCM – BCM: Rear left turn light - too many loads or faulty load

The circuit is drawing more electrical current than the module allows. This overcurrent condition is typically caused by a short circuit, a defective light assembly, or an overloaded circuit (such as from a trailer or aftermarket accessories drawing too much power).

• MAGNUM AFS Connect

1. 1

   Disconnect any trailers or implements connected to the tractor to see if the fault clears, as external wiring or trailer lights can overload the circuit.

2. 2

   Inspect the rear left turn light assembly for physical damage, water ingress, or a defective bulb/LED.

3. 3

   Inspect the wiring harness and connectors between the BCM and the rear left turn light for pinched wires, chafing, or shorts to ground/power.

4. 4

   Disconnect the rear left turn light. If the fault code changes from an overcurrent/faulty load code to an 'open circuit' code, the light assembly itself is the source of the excessive load.

1. 1

   Turn off the ignition and disconnect battery power if repairing the wiring harness.

2. 2

   If the light assembly is determined to be the faulty load, remove the mounting hardware securing the rear left turn light.

3. 3

   Disconnect the electrical connector and install the replacement light assembly.

4. 4

   If the wiring harness is the issue, locate the shorted or damaged section of the wire. Repair the wire using appropriate weather-sealed splices or replace the damaged harness section.

5. 5

   Reconnect all components and battery power.

6. 6

   Turn the ignition on and activate the left turn signal to verify the light operates correctly and the BCM fault code is cleared.