15000 miles, had since new. been a swiss watch. had to tow the other day. was cutting out, noticed the tail light would flicker at same time. few tests at camp. had brand new yuasa preseason. running, battery is 14.3. at load relay and fuse block, is 13.6 with occasional drops to near nothing. I haven't looked at a schematic yet and its still at camp. just wondering if anyone has seen this to save me a little time. I expect to find a terminal or wire junction burned. I doubt a ground issue, was same readings grounded at battery and frame and could plainly see the voltage drop.