Battery light & brake light on will not start without booster cables runs for a few miles stalls out trys to start back but will not battery & alternator tested good yesterday I left there car died jumped it off went to go died again... The positive battery terminal has a fuse box on it I replaced it a month ago but it was broke I got another 1 put it on I couldn't get it tight so my wife went to a shop they done it free but the 3 cables for the positive battery terminal had a plastic piece between 1 of the 3 so they didn't short out I'm guessing the (MECHANIC) took this plastic piece off would that plastic piece being removed cause this problem?? Thanks for your help O yea and before this I walked out to try to fool with it heard a weird noise coming from under the hood no key in ignition or nothin I lift the hood and the noise was coming from the fuse box The Front Ecu I think big green box lookin thing I know nothin about the relays n Electrical stuff on cars