Originally Posted by kimmo
The alternator makes horrible grinding noise and the belt is also slipping. Would it be possible for the alternator being so heavy to turn it takes all the power to turn that?

kimmo

No- the engine should have enough power to easily overcome the belt once it's started. Considering the belt is slipping, that should pretty much take the naff- but spinning- alternator out of the picture. Is there anything else on that belt, or can you remove it without consequence?

Does the grinding sound like a rumbling, say bad bearings, or is it a metal-to-metal sound, like the rotor is scraping the stator?