Re: I have a 1990 audi 200. When accs. turn on alternater...
I agree. Replace the battery first. It's under the back seat, which will lift up after undoing two screws in the front of the bottom of the seat. Remove negative terminal, remove positive terminal, lift old battery out, put in new one, attach positive terminal, attach negative terminal, reinstall seat, and you're done.
If that's not the issue, you may need to replace the alternator.
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If it's happening while driving and no brakes applied it's probably a belt causing the noise. There's a product available in most local auto shops that you can use to lubricate the belt. I think the actual name is "stop squeak" but I'm not positive. If it's squeaking while breaking you may need new breaks or your breaks may be too tight. Another product exists for breaking squeals available in your local auto shop
If you take the belt off and there is no noticeable in/out, up/down, or side to side movement of pulley and there is no noise when rotating, a new belt may be all you need. Make sure you check ALL of the other belt driven components including idler pulleys and belt tensioner pulley. A worn tensioner can squeak also.
This sounds like the power steering belt is slipping, this will cause a loud squeal, check all the belts and make sure they are good and tight, mostlikly its the power steering belt as the noise only happens when the wheel is turned.
Well, if the alternator belt squeaks a little, it cannot be actually charging properly, resolve that...
First steps would be to fully charge the battery and measure the voltage. Turn of vehicle Disconnect the negative terminal overnight, for a night or two.
If battery still dead, focus on the battery.
If battery is not dead, put a volt meter between the negative terminal and cable and measure voltage... do not be mislead by interior lights, or clock, pull those fuses, during testing...
Anyways, keep going until you find a drain.
The alternator has diodes that can cause a drain...disconnect for testing purposes...
NEVER run the vehicle with the battery cable dicsonnected.
I would bet that there is a pully on one of the accessories that is about to stop turning. I would remove the belt and make sure that all of the acc. turn with out to much effort. I.E. altnator the tenstioner, as well as the a/c and idler pullys.