John Deere 002372.06 – BLC / CLC: Brake Lights On Tractor High Amp Draw

The controlling module has registered an amperage in the brake light circuit that exceeds the predefined threshold. The '.06' FMI specifically points to a 'Current Above Normal or Grounded Circuit' condition, which is typically caused by a short to ground in the wiring harness or a faulty component drawing excessive current.

• 6110M
• 6120M
• 6130M
• 6135M
• 6140M
• 6145M
• 6150M
• 6155M
• 6170M
• 6175M
• 6195M
• 6110R
• 6120R

1. 1

   Visually inspect the brake light wiring harness from the control module to the rear tail light assemblies for chafed or melted insulation, pinched wires, or corrosion in connectors

2. 2

   Check for any non-factory aftermarket accessories tapped into the brake light circuit that could be overloading it

3. 3

   Inspect the brake light bulbs for any visible defects, though a shorted filament is less common than a wiring issue

1. 1

   Isolate the circuit

   Disconnect the main wiring harness connector at both the left and right rear tail light assemblies. Clear the diagnostic trouble code and activate the brakes. If the code does not return, the fault is likely within one of the tail light assemblies.

2. 2

   Identify the faulty side

   If the fault disappeared in the previous step, reconnect one tail light assembly at a time and re-test. The side that causes the code to reappear is the source of the issue.

3. 3

   Wiring harness test

   If the code returns immediately with the lights disconnected, the fault is in the wiring harness. Disconnect the harness from the BLC/CLC module to avoid damaging it. Identify the brake light power wire and measure resistance between it and a known good chassis ground. A reading near zero ohms confirms a short circuit to ground.

4. 4

   Brake pedal switch test

   Test the brake light switch for proper operation and continuity to rule it out as a contributing factor.

5. 5

   Safety First

   Disconnect the tractor's battery to prevent electrical shorts and ensure safety during the repair.

6. 6

   Repair shorted wiring harness

   Trace the affected section of the wiring harness to locate the exact point of the short circuit. Cut out the damaged section, splice in a new piece of wire of the same gauge using high-quality, sealed connectors (heat-shrink butt connectors), and wrap with automotive-grade electrical tape or loom.

7. 7

   Replace faulty tail light assembly

   If a tail light assembly was identified as the cause, unbolt the old assembly from the fender, disconnect the wiring connector, and install the new tail light assembly.

8. 8

   Reassembly and final testing

   Reconnect all wiring harnesses and the battery. Turn the tractor on, clear all diagnostic trouble codes, activate the brakes to verify correct function, and re-check for any active fault codes.