John Deere 002352.05 – RLC: Low Amps at Grab Rail Headlight Low Beam

The Roof Lighting Control Unit (RLC) has detected lower than expected electrical current at the grab rail headlight low beam pin when the headlights are turned on. This indicates a failure preventing the headlight from drawing its normal amount of power, which is primarily caused by a blown headlight bulb or high resistance within the electrical circuit due to corroded connectors or damaged wiring.

• 6M Series
• 6R Series
• 6110M
• 6120M
• 6130M
• 6145M
• 6155M
• 6175M
• 6195M

1. 1

   Visually inspect the entire low-beam headlight circuit for physical damage, exposed wires, or chafing

2. 2

   Check the headlight bulb for a broken filament or failure

3. 3

   Inspect the low-beam headlight fuse for a blown fuse indicating a short circuit or current surge

4. 4

   Check for secure connections, especially the main electrical connector at the back of the headlight assembly

1. 1

   Park machine safely

   Lower all implements, shut down the engine, remove the key, and disconnect the battery ground strap to prevent electrical shorts.

2. 2

   Test the headlight bulb

   Remove the low-beam headlight bulb and test the electrical contacts with a multimeter set to continuity or resistance (Ω). A functional halogen bulb will show under 10 ohms. An 'OL' or infinite reading indicates a broken filament and the bulb must be replaced.

3. 3

   Test headlight socket for voltage

   If the bulb is good, reconnect the battery. Set the multimeter to DC Volts, turn the headlight switch to low-beam, and probe the ground and low-beam power terminals of the connector. A reading of approximately 12 volts indicates power is reaching the socket (pointing to a poor connection at the bulb terminals or a faulty socket). No or low voltage confirms an upstream wiring or module problem.

4. 4

   Inspect wiring and connectors

   Disconnect the battery again and trace the wiring harness from the headlight back towards the cab. Disconnect connectors, inspect for green or white corrosion, and clean with electrical contact cleaner. Ensure pins are not bent or pushed out, and look for areas where the harness might be rubbing against the chassis.

5. 5

   Replace faulty components

   Replace the bulb, repair/replace corroded connectors or broken wires using an electrical connector repair kit. If all wiring and components are in good condition and power is not being sent from the control module, replace the RLC module as a last resort.