i need help
 

My trucks battery light came and message said check charging system so I checked the battery, belt ,alternator i had it checked out and it's good but when i disconnected the wire on the back i arc it twice now i have no power the trucks completely dead i need help guy's give some ideas i check and replaced 175 mega amp fuse it's good checked fuses i cant find anything wrong with them I'm lost point me in the right direction