As far as the belt issue goes, take the edge of a metal yardstick, and put it across the entire flat face of the crankshaft pulley and the altenator pully. The two faces should be in line with each other with no gap present between the yardstick or the pulleys. If there is a gap of more than .010 (ten thousandths of an inch) the pulleys are considered to be out of line with each other and need to be aligned.
Also, like Spareparts said, from a side view, CAREFULLY (don't get too close) look closely at both pulleys while the engine is running. Does the front of the pulley look like a solid line or is it a little blurry? If it's blurry that means the shaft it's rotating on is bent or the hole in the pulley is not 100% perpendicular to the pulley.
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1987 V20 w/1987 150HP Yamaha on a Shoreland'r Trailer
1978 16.5 Airslot w/1996 120HP Force on a Four Winns trailer
1996 V21 w/1993 200HP Mercury on a Shoreline Trailer
All towed by a 5.7L Hemi Durango.
If God didn't have a purpose for us we wouldn't be here, so
Live simply, Love generously, Care deeply, Speak kindly.
(Leave the rest to God) 
Silence, in the face of evil, is itself evil. Not to speak is to speak, not to act is to act. God will not hold us guiltless.
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