Bad Voltage Regulator?
#1
AudiWorld Super User
Thread Starter
Join Date: May 2001
Posts: 2,645
Likes: 0
Received 0 Likes
on
0 Posts
Bad Voltage Regulator?
I think the voltage regulator in my 88 80Q has gone bad. I put a multimeter on the battery and it read 12.6v, perfect. But when I started the engine it shot up to 14.6v, even peaked as high as 15.2v. After the engine warmed up, I noticed the RPMs would drop about a hundred for a few seconds, during which time the mulimeter would go haywire. If this is the voltage regulator, does it require replacement of the entire alternator, or can the regulator itself be replaced? How much would either option cost (ballpark). Thanks a lot.
#2
Re: Bad Voltage Regulator?
I had to replace my alternator due to some internal fault in the unit - it suddenly started to discharge my battery VERY rapidly.
You can buy the voltage regulator separately or just the alternator or both as a unit but quite expensive items. I opted for a used but younger alternator from an Audi used parts dealer for a lot lot less.
I have a voltage dial in my car and it does as you describe upon startup but holds a constant voltage above 12v when the engine reaches normal idle speed. Have you tried measureing the voltage at the voltage regulator terminals?
You can buy the voltage regulator separately or just the alternator or both as a unit but quite expensive items. I opted for a used but younger alternator from an Audi used parts dealer for a lot lot less.
I have a voltage dial in my car and it does as you describe upon startup but holds a constant voltage above 12v when the engine reaches normal idle speed. Have you tried measureing the voltage at the voltage regulator terminals?
Thread
Thread Starter
Forum
Replies
Last Post
rohulp
A6 / S6 (C6 Platform) Discussion
5
01-08-2009 08:46 PM
dragon-ryder
Audi 90 / 80 / Coupe quattro / Cabriolet
11
05-28-2005 06:16 AM
Bariukas
A6 / S6 (C5 Platform) Discussion
3
10-21-2004 05:45 PM
Mr. White
A4 (B5 Platform) Discussion
6
12-11-2002 09:12 AM