So yea, didn't go to plan .
Had the yellow wired up to the battery
Black to earth
And red to accessories
Turned the car on nothing! so looked everything over , check the earth noticed that wasn't a good ground so wiggled it deeper into its hole and pofhttt smoke started coming out the Aux hole on the face :( . Checked the little 10 amp fuse at the the back of the unit and it was not blown. Haven't tried anything since. I think the unit is FOOOOOCKed