Trying to fit 2 MPG

[keith wainwright]

I converted my m300 Quite a while ago and after a few hiccups got it to work just fine. I use a ess smoothsteper and 2 bobs. I decided to fit 2 MPGs of the internet , simple 4 wire items easy to set up they say. Gave each 5 volts from the bobs and the ground from the same bob put the other 2 wires to inputs . In setting's I set for bob no 2 and input 2 and 3. Nothing at all happens? Changed inputs to proper inputs. Nothing? changed power to a phone charger . Nothing . Any body know what the simple thing is I got wrong. Thanks