First hit the bolt very hard using a wide flat punch. It may work for you. If not is needed to break up the rust or what ever is seizing the bolt in its thrteaded tapped hole.
You can do many other things to get this off
Heat it with a small propane gas cylinder untill the bolts head is red the swat the head of the bolt firmly hard. That will loosen it
Or you can leave a UV lamp on all night shining closely at the bolt, then swat that bolt in the morning
Swatting the bolt loosens up rust that is the major cause of frozen bolts
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If these resolutions do not work at all you need to drill it out and use an easy out tool for removal
Try getting it hot with a torch. if that dont do it then you will have to do what it takes including breaking the bolt, prying off the water pump and drilling out the broken piece. a trick i use on broken bolts that stick out even a little is i weld a nut on it and back it out with a wrench. it works 99.9% of the time.
Fig. Fig. 1: Rear terminal alternator
Fig. Fig. 2: Side terminal alternator
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