I have the instructions but I still don't understand them. I am using a y off of my gear switch, 1 lead goes to me retract servo, the other goes to the 3 wire lead on the MERS switch. The other side of the MERS switch has 2 wires, light & dark blue. The light blue wire is supposed to go to the red wire on my light, the dark blue wire goes to the neg. side of the battery. What happens to the neg. side of the light? I have 2 wires, red & black coming from the light. What am I missing?

R/C Foolish