I need some help. This picture explains my current setup. I'm trying to use last years 5v RGB strings on the same universe as the 12v strips in the front yard. At this stage, the 1st (12v) element does what I expect, the 2nd (5v) element does what I expect. The 3rd element (12v) has a panic attack (ie flickering lights of random colours). I tested the voltage on the lead in cable, and it's at 12.2v (my PSU is set to 12.48v). I'm sure I need something else grounded, can anyone offer any assistance on this?