Pump Wiring Troubleshooting

Before testing the wiring and controls, make sure your dump trailer’s battery is charged to at least 12.0 DC volts. If there isn’t a battery load tester to test the battery, depress the test button on the battery charger to check the battery charge state. A DC voltmeter, 12 volt tester or power probe is required to test the dump trailer properly.

If the Pump Does Not Run:

1. Start by connecting the test light’s ground clamp to the negative battery post. Touch the point to the positive post to make sure the test light lights up.
   
2. Now, touch the test light to the dump trailer solenoid. The positive battery cable light should be on.
   
3. The pump motor should run when the up or down button is pressed while touching the small brown wire at the motor solenoid. If the light does not light up on one or both buttons, either the controller input voltage (typically the black wire) is missing, or the push controller is bad.
   
4. If the above tests are okay, touch the large terminal opposite the positive battery terminal on the motor solenoid. If the test light lights up and the motor still does not run, and there is certainty that the battery voltage is normal, the pump motor has lost its ground or the pump motor is bad
   

If Pump Runs but Box Does Not Go Up or Down:

Warning: a low or under-charged battery will allow the pump to run and sound normal, but will not allow enough power to activate fluid solenoids to allow them to open the up and down valves properly. If the battery voltage is low, the trailer will go up but will not come down even with the pump motor running.

Recheck the battery state of charge before assuming the pump on the dump trailer is bad.

1. Check all small wires and ensure they are connected to the small fluid control solenoids. Check the small gray wires leading away from the two fluid solenoids and make sure they attach to a solid ground point.
   
2. While pushing the up button, probe the terminal at the green wire (Carry-On) or red wire (Interstate). If the light is on, the solenoid is getting power.
   
3. While pushing the down button, probe the terminal where the blue wire (Carry-On) or green wire (Interstate) attaches to the dump trailer fluid solenoid. The light should illuminate.
   

If both wires are lighting up and the box still does not power up or down, please call us for further assistance.

If your dump trailer is not dumping all its contents:

• Your trailer might be overloaded.
• The load may not be distributed properly in the bed, having too much material in the rear of the trailer.
• You might be raising the dump bed all the the way and trying to dump the entire load in one spot without moving forward.
• The trailer might be higher in the front due to the hitch height. You will need to adjust the hitch height to help with proper dumping.

If you have any questions outside of what is covered in this Troubleshooting guide, please call us at 480-409-0196.