Genmitsu 4030 spindle issue

I’ve recently gotten a Sainsmart Genmitsu proverxl 4030 cnc router, its all hooked up, using Candle software, I can get all xyz axis to move, but I can’t get the spindle to turn on, either by the software or on the controller directly… I’ve verified the wiring is correct, just wondering is there something I might be missing?