belt throwing issues

I had an 89 GMC S-15. Had a new motor put in but the mechanic never put the PS pulley on all the way. Tossed the serpentine belt at least 3 times before I figured it out. Last belt ripped out the elec connection on my A/C compressor, had to get a new compressor because of that! :banghead: Like others have said, sounds like an alignment issue.