What rig do you have? Searched...06 Camelot.
I installed the vms330 in my 08 Navigator using the Kenwood monitor, not a Aladdin. Grounds on RCA cables is the large outer portion of the cable end...can be bent in some but unusual to not make a connection...ground.
I have a video switching unit (center portion of the dash) for my side cameras...vms taps into it using RCA cables. Display messed up and unplugging the 12V power to it fixed the only problem I’ve had with the system.
This post is my opinion, worth what you paid for it.
Our ”New” ride...08 HR Navigator 45’. A nice upgrade after 14 years with a 04 Dynasty 42’.