battery drain electric issues

[nictherom]

i have a 72 chevy i installed a new battery sounds of dixie horn and radio my uncle decided he was gonna "fix" all my jimmy rigged wiring yet today when i went into walmart i came out and my battery was dead got a jump drove home on the way home my lights were dim except when i would come to stops they would get bright again then the radio started flicking on and off on its own then i started hereing thumping sounds from the engine compartment my distributor is run off the battery so im thinking that had something to do with it any ideas on wat the hell is goin wrong with it this time