Good day, I have recently assemble a tele from two different guitars. One was a Samick and the other Johnson. I am concerned that I may not grounded the guitars properly. 1. I used the electronics of the Samick which I don't remember making much noise for a single coils guitar. 2. It also did not have a ground from the bridge to the control pot but rather a ground coming from the baseplate of the bridge pickup. 3. The new guitar makes a fair amount of noise in position 1&3 that doesn't go away when I touch the strings. It's, obviously, quite in position 2. 4. I've lent the guitar to a student and the room she practices in is full of light dimmers. It is just normal single coil behavior or should I run a ground wire from the bridge? Thoughts? Thanks!