Dimarzio single coil wiring question

[SpliffyJonez]

I got a dimarzio stacked single coil with two wires, red and green.

 

I assume red=hot and green=ground, right?

 

What would happen if these wires were connected the opposite way? could tis reduce hum?

 

I think this stacked single coil should work the same as a Fender "Noisless" one, but for some reason it still gives off much hum (when I'm not touching strings). The wire connecting the two stacked coils is intact.

 

I wonder if this is because it's mounted in an acoustic. WHen I used a regular single coil, it gave off even more hum...but still, noisless should be totally noisless right?

[walfordr]

Are your strings grounded?

 

BTW: Its a stacked humbucker, not a single coil.