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1986 jeep comanche 4X4 2.4l engine my alternator light was on for months. one day i went to start it, nothing. i changed the alternator and motor craft solenoid. my husband had undone the negative cable from the solenoid to the battery. after i installed the alternator and solenoid i had not known my husband unplugged the negative cable (he did it when i was getting the parts), after i installed all the new equipment i turned on the light switch for the headlights and turned the key... nothing. i went to go check the cables and saw the negative to the solenoid unhooked, i hooked it up and tried again. still no start and no lights. i took the battery to the store to have it charged. i was told it was discharged. took it back and hooked everything back up. still no lights and no start. checked the starter by jumping it. the engine turned over yet would not stay on. i still have nothing when i turn the key and no brake lights or headlights? what is wrong and how can i fix it?