@ neutralFan, because of this thread: BLF Kronos X5 mod x6 mod faq thread tailcaplight.
OK, now back to my problem,
I found what is the problem I think. When I soldered the driver and the mcpcb and left it outside of the flashlight, it worked fine. The problem surfaces when I put it inside the host.
I measured the resistance between the point where I am supposed to solder the black wire (negative) and the bottom of the mcpcb and the resistance is 0 Ω. Is that normal?
From what I understand it bypasses the minus the black wire of the driver and it gets the minus straight from the battery.
I also tested my theory by connecting the mcpcb with the driver outside the flashlight and feeding the negative straight from the battery bypassing the driver.
I am guessing there is something wrong with the mcpcb and not with the host. Am I right?
HELP!!!