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Old December 18th, 2015, 13:39   #31
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Join Date: Mar 2009
Location: Houston, TX
Fuel Economy: 42-50

Typically 11.5 - 12.15 v at the battery terminals at startup but would typically return to +14v after the engine warmed up. After replacing the regulator it improved to 14v consistently even when cold but the last few days has been consistently <12.5v even when warm.
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Old December 18th, 2015, 13:47   #32
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Join Date: Oct 2013
Location: Canada
TDI(s): None

Originally Posted by chirishboy View Post
Typically 11.5 - 12.15 v at the battery terminals at startup.
During cranking of the engine, a lower voltage is normal due to the load and increased current. But that just takes a second. BTW, hard to measure since the load varies unless you have a storage scope or DMM with max min hold.

You should always be getting 14.0 to 14.4V above idle and depending on the load. When cold, those numbers will be slightly higher and when hot, in the upper 13s.

Maybe your diode pack in the alternator is acting up once hot. Then your DC has some partial AC on it.

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Old December 18th, 2015, 19:49   #33
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Join Date: Aug 2009
Location: Lompoc, CA

Those rings don't look bad but how are the brushes? Mine had grooves at least 1/16" deep when I got the charge light but the brushes were worn too so there was poor contact.

I got another week out of them by pulling on the brushes to stretch and straighten their wires so they wouldn't try to pull them away from the rings.
Saying no to gas for 25 years:

Current: 02 Jetta, Auto; 98 Jetta, 5 Spd; 98 Dodge, 5 Spd, SB, 4x4; 84 Grand Wagoneer with Nissan SD33T, NV4500, Dana 300, Reverse Cut Dana 44, Dana 60

The Black Sheep (Only gasser): 85 CJ, 4.2 w/4.0 Head and Mopar FI.

Past: 85 Mitsubishi PU, 4D55T; 81 Rabbit, 1.6; 80 Dasher, 1.5; 79 Rabbit, 1.5
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Old November 5th, 2019, 22:42   #34
Join Date: Mar 2012
Location: San Diego, Ca

Has been 35k miles since the rebuild. Everything still running well.
2003 ALH Jetta Wagon, Automatic
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