'72 C-10 door lock actuator relay clicks repeatedly

[auminer49r]

Hello Chevy people,
I just installed A-1 Electrical power door lock actuators in my 2 door 1972 C-10. I think that I followed the directions well. however, when I unlock the driver's door, nothing happens to the passenger door lock. I just hear click, click, click, repeatedly from the relay under the dash. I wired the ground to the a screw in the kickpanel vent bracket.

What could it be?
actuator not strong enough? ground not good enough in the kickpanel?
rod clamp not aligned properly in the passenger door?

I can't quite figure it out