Case IH 518107-00 - BCM – BCM: Work lamp #3 - too many loads or faulty load

The module monitoring the lighting circuits has detected an excessive current draw on the circuit dedicated to Work Lamp #3. This condition is typically caused by a short circuit, a defective lamp assembly (internal short), or unauthorized aftermarket lights/accessories being spliced into the same circuit, exceeding the maximum amperage threshold.

• MAGNUM AFS Connect
• Optum AFS Connect
• Steiger AFS Connect
• Quadtrac AFS Connect

1. 1

   Visually inspect Work Lamp #3 for physical damage, cracked lenses, or water ingress, which commonly causes internal shorting.

2. 2

   Check the wiring harness leading to Work Lamp #3 to ensure no aftermarket lights or additional electrical loads have been spliced into the circuit.

3. 3

   Inspect the wiring harness running from the BCM to the lamp for chafing, pinched wires, or exposed copper shorting to the tractor's chassis/ground.

4. 4

   Disconnect Work Lamp #3 and cycle the key. Check if the fault code changes to an open circuit code (such as 518107-05). If it changes, the fault is isolated to the lamp assembly. If the code remains, the short is in the wiring harness or the BCM.

1. 1

   Turn off the tractor, lower any implements, and disconnect the battery.

   This prevents electrical arcing.

2. 2

   Locate Work Lamp #3 on the cab or fender.

   Refer to the operator's manual for the exact numbering sequence of the 360-degree lighting package.

3. 3

   Disconnect the electrical connector at the lamp and inspect the terminals.

   Look for corrosion, water damage, or melted pins caused by excessive heat/current.

4. 4

   Remove any unauthorized aftermarket loads spliced into the circuit, if present.

   Restore the factory wiring.

5. 5

   Replace the Work Lamp #3 assembly if the diagnostic checks isolated the fault to the lamp.

   Remove the mounting hardware and replace the assembly.

6. 6

   Repair or replace the damaged wiring harness.

   Repair the chafed or shorted section using proper automotive wire splicing techniques (solder and heat shrink), or replace the affected harness pigtail.

7. 7

   Reconnect the battery and turn on the ignition.

8. 8

   Clear the BCM fault codes.

   Use the tractor's AFS Pro 1200 display or a dealer diagnostic service tool.

9. 9

   Activate the work lights to verify proper operation.

   Ensure the 518107-00 code does not return.