PLR

Before doing 10 -10 test:

1. Shut off the truck engine
2. Unhook the charge coil from tractor/truck
3. Shut off the battery charger
4. Disconnect any outside battery source

Confirming battery voltage with 10 -10 test:

1. Using a multimeter, set on DC voltage
2. Attach the voltmeter negative to the negative post on motor
3. Attach the voltmeter positive to the positive post on motor
4. Using the lift switch, raise the platform to bed level
5. Keeping the switch activated, deadhead the motor
6. Keep the switch activated for ten (10) seconds and observe the multimeter reading
7. Ten (10) volts for ten (10) seconds is the desired result
8. If the reading is less than eight (8) volts, the batteries are low and need to be charged
9. Retest after charging
10. Replace batteries and check all connections and grounds if you cannot get 10-10

Do You Hear Solenoids Clicking

1. Check the circuit breaker at the batteries
2. Go to "Motor Not Running"

Hear No Solenoids Clicking

1. Check fuses at pc board
2. Check for bad switches
3. Check for bad motor solenoid
4. EQUALS Bad solenoid valve 

1. Jump across large posts on motor solenoid
   • If the motor runs, test for incoming signal on the small terminal and ground on the other small terminal
   • Test the thermo switch in the motor for continuity if the signals are good, replace the motor solenoid
2. Jump across large posts on  motor solenoid
   • If the motor does not run, jump the motor directly with jumper cables from a separate good battery
   • If the motor is not running, tap on the motor; if the motor runs, the brushes are bad
   • If the motor runs, check the motor ground and power to the motor solenoid

Truck: Turn on the cab switch

Trailer: Turn on the switch at the liftgate

• Check the fuse, and circuit breaker at the battery
• Check fuses at the PC board
• Unplug these 3 connections on the PC board:
  • J-31 Hand Control
  • J-3 Warning Lights
  • J-41 x 2 B-13 and B-15 sensors
• M control—check fault codes
  • Clear the code: unplug J-11 and J-1 then plug back in
• Remove the J-30 plug, confirm #4 pin has voltage, jump #4 to the next 4 pins to get up, down, tilt down, tilt up, note last pin is ground do not touch with the jumper on the J-4 pin

Fault Codes

• #1: Liftgate On
• #0: Liftgate Off
• #2: Low Voltage
• #8: Short
• #5: B-15 Problem
• #3: B-13 Problem

Emergency Operation: #E mode—emergency by-pass of sensors

• Turn and hold both down and tilt down knobs for 10 seconds until E code is shown
• Operate liftgate in E mode
• To reset turn the liftgate OFF and then ON

Motor not running: see section above

S1 and S2 valves on lift cylinders not opening 

• If power down check the S5 valve opening and motor running

• First, add a 12-volt power supply direct to the batteries
• Second, move the 12-volt power supply directly to the motor solenoid and ground it on the motor
• Adjust PSI to 3000 PSI
• Change hydraulic fluid to fluid ISO 32