An interesting situation has arisen with my TJ. I was driving it all day with no problems then turned it off for 10 minutes with the hazards on. I loaded up the back with stuff, disconnected my subwoofer box, hopped in and turned the key to find nothing happen. NO turn over, nothing, but the exterior and interior light s and radio work. I checked the battery terminals and cleaned them off. I checked the battery with a multimeter. I bypassed the relay for my starter right to the battery to see if it would spin and it did. I dont think it is the alternator as nothing seemed to dim or slowly die. Visually (also w/ multimeter) checked all the fuses. Also I have never had a burnt out headlight but I noticed after this problem arose that one was in fact out...dont know if its related.
Thanks in advance