To overcome the resistance of water pressure, the electric motor may only use. I'm guessing he's using just a couple of automotive style circuit breakers with a low amperage rating, say 3 or 5 amps. Thus, the motor isn't trying to forcibly move the trim any further than it's originally designed range of motion. The "VTS fix" senses this and cuts the current. It works like this: whenever your trim motor reaches it's newly created mechanical stops, the motor will immediately try to draw more current. Hopefully the designer engineered a few more redundant circuits inside in to keep from burning anything up. The electrical portion of VTS fix is no more than an over-current cutoff switch. If the piece that rides on the threads is kept "captive" on the threads, then you have effectively limited the travel of the VTS mechanically and not electrically as was the case with the stock setup. My theory behind why the trim fix works is how he manages to keep the plastic piece on the worm screw from running off the threads. In any case, he sends along with his magic box a collar which is just a piece of PVC to keep the trim from overextending.
He's even encapsulated the electronics like Bombardier did with the original VTS box, though I'm sure the stuff he's using is a bit better. First of all, the construction seems to be first rate.
I've just bought two of them and have examined them closely. Does this "fix" unit allow your VTS to stop at each extreme or is it supposed to sort of bind at each end? Does this guy who makes this have a phone number? I didnt see one on his site. Im thinking it would need power to get this to happen.
SEADOO VTS POSITION SENSOR SERIES
The origonal VTS circuit board uses a series of "reed" type contacts which are triggered by the magnet to send the position of the nozzle (actually its the plastic screw slider with the magnet) to the gauge.