So, who can tell me what causes a voltage regulator to go bad? Aside from normal time wear and tear factors? If it’s of any use this is an Audi TT I’m dealing with, 2001 225 hp version.
Please bear with me for a moment, I just want to throw all the relevant information about the car out there so if there is something I missed maybe one of you will catch it. I did a timing belt replacement about 4 months ago. For about a week after it drove just fine, and then I noticed the Yellow battery indicator was coming on intermittently as well as the red battery indicator in the speedo area. I noticed that revving the car caused my lights to brighten and letting it idle normally caused dimming. After a bit of a search online and some tests at my local Autozone I decided that the issue was the voltage regulator mounted right on the back of the alternator. During the timing belt replacement we had to knock the alternator pretty hard to get it back into it’s bracket, I worried about the electronics at the time and chocked the voltage regulator issue up to the abuse it required to get it back into the bracket. So, I replaced the voltage regulator and everything seemed great for a couple months until a couple days ago. Same symptoms again. Lights pulsing brighter and dimmer at idle, charging failure, etc.
So, I’m getting ready to do a voltage regulator replacement again, but I’d really like to know if this is really the problem again or if there is something I’m overlooking, what could cause a voltage regulator to go bad, and if you think like I’m beginning to that I just got a faulty part somehow. I did get it at Autozone after all… but it was Bosch and I thought they did a pretty good job?