Ok was working on the kids 2000 TJ, battery tray is out right now so battery is just sitting on bracket, installing new led lights with halo's , testing what wire is what for turn and parking lights, heard a loud pop now no power what so ever. Battery has 12.4 volts, fuse box beside battery has 7.7 volts, nothing works now radio , lights nothing. Anyone have any thoughts please.......................