Open. Isolate the exposed tinned parts of the dimming wires just incase if your not going to be using them. Sometimes if you just hold them in one finger but not touch them they will still dim the light. Any resistnace or volage to them will cause dimming.Hello, quick question. If I don't hook up a potentiometer on the "b" style, do I solder the wires together? Or leave open? Thank you in advance