starter problem????

hi fellas, well this morning i try to star my stang for go to the work, but i put the key in the ignition switch the fuel pump hear, the tachometer ligth turns on, all normal, but when i turn on the switch i hear an a click and then zero current, the claxon dont work, the power locks dont have current, the heads ligths to, actually the interior ligths dont work to, i have the car without a courrent, so i check my batery and it has a -12.4 v, i disconect the starter wire, and then all the courrent come up, the powers lock work again, the claxon, the interior lamps, averything, but the i reconect the starter wire and all fine and when i try to star the engine and i turn the switch to the on position then bump another click, and again no courrent at all, is this trouble generate from the starter? or is the batery?

actually i discharge the switch because i disconect the starter wire, and then the all courrent cam back, i trun on the switch and i heard a click in the solenoid where the psotive batery engages, that one thas is locate between the batery and the shock tower, y reconect the starter wire to this solenoid and the all courrent was out, totally death. is this means that the trouble is in the starter?