First post here: I have a BW s300v turbo controller module. It has a 4 pin connector. I determined the battery, ground and PWM input lines to control the actuator motor. However, the fourth wire is unknown. Does anyone have a similar turbo and controller that they have connected? I am looking for the connection of the fourth wire. Battery is red/grey, ground is green/white and the PWM input is green. The fourth wire is purple. I'm thinking it is an output for the position or feedback for current sensing. Any ideas would greatly be appreciated on how to wire up this output!