[n4mwd]

I'm not sure why you are breaking off bolts. The bolts they use are special in that they break before damaging threads. So whatever bolt you replace it with needs to be soft steel. Don't use a hardened bolt.

Sometimes the bolts are damaged by overtorquing but don't break until later. It could also be that you are using the wrong scale on the torque wrench (ft-lbs instead of in-lbs, etc.). Or you are using the wrong torque value. Or the wrench isn't accurate.

The alternator bolt is only 50 ft-lbs and is pretty easy to torque. Just make sure the key is in place and all the starter gear stuff is there too.