fuse keeps blowing when a/c compressor kicks on on 1999 Oldsmobile Alero

My sister inlaw had her son put on a new starter but he had a wire crossed then it did damage to the alternator replaced that. Now when the a/c compressor kicks on it blows the fuse, she took it to a mechanic he says he checked all the wiring and can't figure it out, he thinks it might lay in the computer.

Asked by for the 1999 Oldsmobile Alero