pizzaguy,

thanks for alerting me to this thread yesterday. It is Monday during peak season here, so I need to keep my response short.

- The pump changes rotation when lowering the tonneau cover, and I never see the pump moving to lower the cover in the video. Easy experiment: swap the two (identical) relays on the pump and see what happens.

- Travel sensors cannot be bypassed. The controller sends a modulated signal, and it basically reads the amount of modulated current that passes through the sensor. That current changes based on how magnetically permeable the material is around the magnet in the travel sensor. The presence or absence of a steel cylinder piston shaft makes that difference.

- Travel sensors are solid state, and quite reliable. It is rare that they fail. Most 'sensor failures' are from wires being pulled hard on the sensor itself, or from wire abrasion on the way to the controller, or from the sensor not being fully snapped into the cylinder's rail. You can swap the sensor in question with one from the main lift cylinder by cutting and splicing the wires - the sensors are identical. Polarity matters, and you can figure it out based on the color of the wires.

- Once the rear bow has reached the highest position, activated solenoids 2 and 3 on the pump are supposed to hold up the rear bow. It would be interesting to know whether two of the four solenoids on the pump are getting 12VDC while the rear bow is falling down again.

Klaus

tophydraulics.com