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Re: 98 buick regal GS intermittent turn signal problem
Welcome to AF.
This is a common problem on '97 and up Regal LS/GS models. You will probably need to replace the multifunction switch (MFS) - stalk. But first make sure the lamp socket is not bad and the ground wire is good. Plus measure for the flashing 12 volts at the socket with a DMM. The OEM and aftermarket MFS switches are expensive but you can save money if you do the work DIY. About a 1 hour job. Let me know if you need the DIY procedure.
On your stereo problem you may have a bad speaker affecting the others and the amp output.
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