So i have a 7 bulb led flashlight that runs on 3 -3.7 volt 26650 batteries. I attempted to remove the head of the flashlight and wire it through a pvc tube to place the battery tube (powersource) further away. About 3.5 ft away from the flashlight head. I used thick 12 guage wire and it appears i fried the circuit board. Any ideas on what i did wrong and how to correctly determine the proper wire size needed?