Vts weird symptoms

[zachholmes02]

94 XP: I bought the ski without VTS motor but VTS works flawlessly manually. I bought a motor and I get voltage where I am supposed to get it on the ski/ module side of the connector. I can actuate the motor flawlessly both directions with my power probe while hooked up....

Buuuut while the connector is connected together it only twitches both directions and when the engine runs it allows the vts to trim down only while stuttering with the engine rpms's.

Im pretty good with this stuff usually but I don't have a diagram to the module to see what components it uses. I assume some limit switch of sorts that im guessing is bricked and folds under super low resistance (usual motor operation), compared to when it hits the stops. TIA!

 

[tobytd]

I could be wrong, but if I remember correctly, a bad VTS Control module has the possibility to mess up your mpem.
Unplug everything. Google, trim fix.

 

[AKnarrowback]

I believe the VTS uses some type of current sensing circuit to shut the motor down.

I modified my 94 trim nozzle to get a lot more throw in the up range. When I'm running full throttle it will only trim up a certain distance and then shut the trim motor down. When I back off the throttle I have to trim down for a split second then I can get it to trim upwards again. The logic being on a stock setup you reach either full up or full down trim, the nozzle physically is blocked, current draw goes up and the brain box kills power. Since you are either full up or down the only logical way to go is the opposite direction, the brain has locked you out from pushing the nozzle any further. My setup allows enough nozzle angle that at higher throttle the pump thrust is more powerful than the vts motor can push against and I can't get full up trim without reducing throttle.