if it doesn't spin at all, yes it is broken if it doesn't spin at all, yes it is broken
the pulley on the harmonic balance drives the alternator belt. this is the pulley at the bottom of the engine ,on the front of the crank shaft if this pulley is not turning you have a problem. this means either the key is missing or the crankshaft is broken
your water pump and or alternator is frozen ( broken )
Crankshaft pulley diameter X RPM / alternator pulley diameter = alternator Rpm
you need to replace the alternator
You will need to loosen the alternator belt with the tensioner pulley. When the tensioner pulley is loose the alternator belt will become loose. Put the new alternator belt on and tighten the tensioner pulley.
Loosen the tensioner pulley. Put the belt around the alternator pulley and the tensioner pulley. Move the tensioner pulley to the right until the belt is tight. Tighten the tensioner pulley.
If an idler pulley is broken, I would advise not to drive it anywhere. It would effect the power steering, water pump, alternator and coolant fan causing you to get stuck on the road and possibly cost many more $$ in damage.
the belt only goes around the crank pulley and alternator pulley
You will need to loosen the tensioner pulley. Put the alternator belt on. Push the tensioner pulley to the left until the alternator belt is tight. Tighten down the tensioner pulley.
YES
The water pump pulley is the pulley right above the crank pulley (the big pulley in the bottom of the engine.) Right above the water pump pulley should be the alternator pulley, which drives the alternator. I'm guessing the water pump is behind the WP pulley. == == == ==
An alternator turns to the right, if facing pulley from side.