Hi Tom, on VDF(VLT2-Oscillating) to out put card, I have a grey wire go from VDF S1 to output card pin 4 (oscillating motors). On low pressure tests, the Pre Soak, Spot free rinse and Low PH Pre Soak are working correctly with (spray water) and oscillating the output cars pin 4 LED is turn on. When on high pressure tests, the HP Soak, HP Wax, HP Rinse, Med Pressure are partially work, water shooting out good but won’t oscillate, the output card pin 4 LED is off. Don't know why there are no signal to turn on pin 4 LED when it's on high pressure tests. Tom, would you please check on your system on the output card, how many wires on pin 4 output card, on my system there is only one grey wire on output card pin 4. Thank you very much for you help.