Then you have a short circuit that is sending power down through the blue wire someplace. The trim pump uses 2 wires, a blue and a green. If you put power to blue, the motor goes up, power to green, and it goes down.
Shorts will either stand right out, or can be extremely extremely hard to find, and you can spend all day on it. But 9 times out of 10 where the problem is, is a bad switch in the remote control handle that is putting power to the blue wire. Or, in the remote control, where the trim wires run down through the handle.
What I would start with first is popping the handle off and inspecting the wires for the trim where they run into the handle, and and to the control box. It is usually right there in that point, where it leaves the handle and goes into the box that they chaffe and the red wire puts power to the blue wire.
There is a grommet in there that is supposed to keep that from happening, but the grommet likes to fall out over time.
I would start by looking for shorts in that area first.
Like I said before, its either going to be real easy to find, and the short is right were I said it would be. Or its not, and you can spend all day looking for it.
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