John Deere 002386.05 – RLC: Flashing Light Low Amp Draw

The Roof Lighting Control Unit (RLC) has detected a lower-than-expected electrical current draw in the flashing beacon light circuit. This indicates an open circuit, a high-resistance connection, or a failed component (such as a burnt-out bulb) in the beacon light system, which affects the proper operation of the flashing light.

• 6110R
• 6120R
• 6130R
• 6145R
• 6155R
• 6175R
• 6195R
• 6215R
• 6110M
• 6120M
• 6130M
• 6140M
• 6145M
• 6155M
• 6175M
• 6195M
• S760
• S780
• S785
• T550
• T560
• T660
• T670

1. 1

   Cycle the key switch off and on to see if the code clears, as the fault may be temporary

2. 2

   Inspect the beacon light bulb for a broken filament or signs of damage (or verify LED function if converted)

3. 3

   Visually inspect the wiring harness and connectors leading to the beacon light for chafing, cuts, corrosion, or loose connections

4. 4

   Check the main battery, starter, and chassis ground connections to ensure they are clean, tight, and free of corrosion

1. 1

   Replace beacon bulb

   If the bulb is found to be faulty, replace it with a new one. If the bulb appears intact, it is still recommended to test with a known good bulb to rule it out definitively.

2. 2

   Check for power

   Using a multimeter or a 12V test light, carefully check for voltage at the beacon light connector with the beacon light switch activated.

3. 3

   Check circuit continuity

   If there is no power at the connector, disconnect the battery. Use a multimeter to check the continuity of the power and ground wires between the RLC and the beacon light connector to identify any breaks in the wiring.

4. 4

   Check for short to ground

   A blown fuse can indicate a short circuit. If a fuse is blown, replace it with one of the same rating. If the new fuse blows immediately, there is a short in the circuit that must be located and repaired.

5. 5

   Repair or replace wiring harness

   If a break or damage is found in the wiring harness, it may need to be repaired or replaced. The outer light roof wiring harness is available as a replacement part.

6. 6

   Replace beacon light assembly

   If the bulb and wiring are confirmed to be good, the fault may lie within the beacon light assembly itself.

7. 7

   Replace RLC module

   In rare cases, the RLC module itself may be faulty. This should be considered the last resort after all other possibilities have been exhausted. Diagnosis and replacement of the RLC are best performed by a qualified John Deere technician using the Service ADVISOR™ software.