2000 Dispatch: Battery light flickering very dim, terminals at 14.3V, alternator replaced 2 weeks ago.

[kenbw2]

Just done a service - including a new fan belt.

Started it up and noticed the battery light is on very dim. While driving it flickers between dim and off, notably when decelerating it goes off entirely

I tried disconnecting the battery with the engine running, light still on dim.

It's definitely charging - the voltage at the terminals is 14.3V

Edit: Notably I had a dead alternator on it 2 weeks ago, which I replaced with a second hand one which worked fine till now.

[Peter.N.]

Do you notice any variation in the brightness of the panel or interior lights? If not could be an alternator fault or a poor electrical connection somewhere. Personally if its still charging OK I wouldn't worry about it, just check the battery voltage periodically. Check the thin wire connection on the alternator.

Peter

[Nemo26]

Google ac ripple test. You have too much ac current in system. Diode failure probably.

[kenbw2]

I hope not, I've just replaced the alternator 2 weeks ago - admittedly with a second hand one, but still.

Does this point to an issue somewhere in my electrical system?

[white exec]

Don't run the engine with the battery disconnected. Risk of damage to both alternator and other electronic items, due to alternator not being able to read a battery voltage.

[kenbw2]

Hmm I do have a dicky positive terminal connection. Maybe that's destroying alternators?