Jeffs 74

Doesn’t come through as well on video, but the alternator seems to be shaking or vibrating a lot.

is this normal?

Mod75

Not normal, take the belt off and spin it.
You will probably feel it binding up. How tight is the belt and what is the condition of it?

Hope this is of help

jhudec

Correct, not common to vibrate. These are very easy alternators to rebuild. Kits are available everywhere.
Joe

doorgunner

OR..........cracked bracket? cracked lower hole in alt case? spacer missing at lower bolt hole?cracked/broken bolts? loose pulley? misaligned pulley on alt? damaged balancer on crankshaft?

stingr69

Bad belt is my vote. Remove belt, inspect and replace it.

Spin alternator and see if it is obvious before tearing it down is my advice. Alternator is fairly easy to tear apart but the front nut can be a booger.

cobrachuck

My 65 was making noise, took it to local starter alternator shop $50 new bearings & checked out.
I also agree with Door Gunner double check that mounting bracket, something looks loose.

pmansbach

Take the alternator out and check to see if the bracket has a crack.

Jeffs 74