Yale 168-0 – Controller / ECU: System Battery Voltage OORH

System battery voltage being detected is higher than the acceptable maximum threshold (often >16 volts on standard systems).

• Yale and Hyster Forklifts
• Yale ERP040VT
• Yale GLC050
• Yale GC135VX
• Yale ERP20VT
• Yale ERC065RGN36TE082

1. 1

   Test the static battery voltage with a multimeter to check for internal battery faults or failures.

2. 2

   Run the forklift and measure the voltage output at the battery terminals to test the alternator (look for spikes >16V indicating a failed voltage regulator).

3. 3

   If battery and alternator output correct voltages, inspect the controller for a functional failure in receiving or interpreting voltage.

1. 1

   Verify Voltage

   Use a digital multimeter to check the system voltage while the machine is off and while it is running.

2. 2

   Address Alternator Overcharging

   If the running voltage is excessively high, remove and replace the alternator, as it is overcharging the system.

3. 3

   Address Battery Faults

   If the alternator is fine but the battery fails a load test or shows an internal short causing voltage irregularities, replace the starter battery.

4. 4

   Replace/Reprogram Controller

   If both the battery and alternator test within normal OEM specifications, the fault lies in the controller's circuitry. Replace the main ECU/Controller and flash/program it to the truck.

5. 5

   Clear Codes

   After replacing the faulty component, cycle the ignition and clear the fault codes from the dash display to verify the repair.