I have a 1948 (46?) Willys CJ2A. I restored/rebuilt the engine last year and all is fine. runs great. However, last week I left the headlights on after i turned it off, and the battery went dead. I tried recharging the battery 3x, but it wouldn't take a charge above 3.6 volts. The local parts store (Rebee's) replaced the 8 month old battery with a new one. It tests a solid 12 volts new, out of the engine. However, once installing the new battery I am back to the same problems as before. Absolutely dead. No starter, no lights (with the key on or off), no horn, nothing.

Anybody have any ideas?