Everything Dies When I Go to Start SOLVED!

He said he charged it all night for a 12.2 volt reading.....If the sniper is reporting this, it must be close as it gets direct power from the battery. How's the gravity of the battery acid? Are the cells filled up to the top of the grates (not overflowing between cells) you can pop the 2 square vents and check. Jumping the battery should have bypassed the corroded terminals. Does the starter click (solenoid sliding over): if that is audibly heard, the contact in the starter is bad or corroded itself as the starter motor contact is directly tied to the solenoid action. Usually if the starter cuts power even to the dome light its a corroded battery connection.