im having a problem with my van its a 1982 chevy van i had changed out the battery and the chables going to the batt. because it fried on me and when i got everything bsck together i started the van and i got this very loud sound from the starter i took the key out and it did not stop.it did not stop till i discounected the positive wire from the battery what could be the problem? if you could pleas let me know