New Alternator - Now Battery Light is on at Start-up Idle...

[86 911]

Thanks for all the help. Thank you kethunk for posting that link. I'll see about installing the resistor. If I get bored (and that is when the car decides not to break down anymore) I'll install the resistor. If this is a common condition that won't hurt anything, then I might end up just blipping the gas pedal on start-up. The battery is good (brand new) and I just haven't been driving the car which probably is the cause of the low voltage. Anyways, thanks to all who contributed. You all saved me many hours this week!

[rolls 912]

Mine has just started glowing ou of the blue and remains so for about two minutes, irrespective of rpm. Would this suggest belt? Or, same as aforementioned?

Cheers

[Joe Bob]

What is the alternator output? Is it charging?

[DRACO A5OG]

+1 get a DVM on the battery while on

[hyperkinesis]

Hi. My car have similar problems, the alternator was rebuild last week but the batery light flash few times 2-3 times when rpm are in 800-900 then turns off. This problem exist before the rebuild alternator. Any recomendation?... In adition in some rare ocations there a fluctuation on rpm from 600 to 1000 up and down, when i acelerate the car that problem is gone

[roadster49]

I have a similar problem. My light comes on at startup and stays on at all engine revs. Installed a new alternator checked ground wires. The light never ever went on with the old alternator even though it was not providing an adequate charge (11.4)

[HaroldMHedge]

Alternator light doesn't go out after startup post #11 brings up a good point about a poor ground.

Originally Posted by Matt_911

I had this issue after repainting my fan and cleaning up my alternator – turns out it I forgot to take the paint the surface where I reattached the ground wire ... rubbed it back to metal and that fixed it.

So I suppose it could potentially be caused by a bad earth on the alternator?