New Holland 1104 – EDC / CCH: Voltage Supply to Lift and Lower Coils Below 8 V

The voltage supplied to the lift and lower coils of the Electronic Draft Control (EDC) system has dropped below the required 8-volt threshold. This low voltage condition prevents the electronic traction control system from properly operating the tractor's three-point hitch, impeding the ability to lift and lower implements.

• T7
• T8

1. 1

   Check battery voltage and charging system health (optimal battery reading is 12.6V; verify that the alternator is functioning correctly and providing a stable charging voltage). Low voltage can trigger ghost codes.

2. 2

   Inspect fuses related to the EDC, hitch controller, or transmission controller (often located near the battery, under the seat, or behind cab panels)

3. 3

   Inspect the wiring harness and connectors leading to the EDC control valve and solenoids for corrosion, damage, or loose connections, including the chassis ground strap

4. 4

   Perform a voltage test at the solenoid's main wiring harness plug with the key on to verify battery voltage is reaching the coil

5. 5

   Perform a resistance test on the disconnected lift and lower solenoids (expected resistance is 6 to 8 Ohms)

1. 1

   Ensure safety

   Turn off the tractor and disconnect the battery cables to prevent electrical shorts before beginning work.

2. 2

   Replace blown fuse

   If a blown fuse is found, replace it with a new fuse of the exact same amperage rating. If it blows repeatedly, trace the wiring to locate and repair the underlying short circuit.

3. 3

   Repair wiring and connections

   Clean or repair any corroded connectors or damaged wires found in the EDC harness. Ensure all connections and the chassis ground strap are secure.

4. 4

   Replace faulty solenoid coil

   If the solenoid resistance is outside the 6-8 Ohm range, unscrew and remove the faulty coil from the stem of the hydraulic valve cartridge. Install the new coil, secure it, and reconnect the electrical plug.

5. 5

   Clear codes and test operation

   Reconnect the battery, start the tractor, and verify the active fault code has cleared from the instrument cluster. Operate the three-point hitch to confirm lift and lower functions are restored.