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Volkswagen EuroVan: 1992-2003 (T4) Eurovan alternator charging between 13.5 and 14.6V, is it normal?


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Last Post: Jun 9, 2014 12:01 PM Last Post By: Big Dan from Qu...
Big Dan from Qu...

Posts: 5
Registered: 08/27/12
Eurovan alternator charging between 13.5 and 14.6V, is it normal?
Posted: May 28, 2014 1:05 PM
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Hi,

I had few issues with the alternator in the last months.

1- Alternator stop charging, resolved changing the alternator.

2- Alternator and starter stop working at the same time, the issue was the ground wire starting from the battery, going to the frame and to the transmission.

3- Alternator stop charging again, changed the alternator again.

4- Now I have a second rebuilt alternator, working good but charging between 13.5 to 14.6V, is it normal? why not charging always at between 14.4 to 14.6V like before? What can be the issue?

Thanks in advance for your help.

Regards,
Daniel

Eurovan 1992 Full Camper, 2.5L Manual 5sp
Francis at Bent...

Posts: 30
Registered: 11/13/13
Re: Eurovan alternator charging between 13.5 and 14.6V, is it normal?
Posted: May 30, 2014 4:15 PM   in response to: Big Dan from Qu... in response to: Big Dan from Qu...
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Attachment starter wire.pdf (123.0 KB)
Hi, I would start by performing a voltage drop check on the power cables to the alternator, battery, and starter. I believe (not sure) that the main power wire runs through the starter from the alternator. Check voltage drop in that line, the line between the starter and battery, and also each connection, IE bolts, power lugs, crimped connectors on cables, including main grounds. But a very likely point of high resistance could be the starter lug. focus on this point and the cables, there's probably not much space but a voltage drop test while cranking could show a corroded power wire that increases in resistance under load. Check for crispy insulation, or burnt looking strands in the cables, this is a good sign of a cable that's increasing in resistance under load. See attached diagram:

Edited by: Francis at Bentley on May 30, 2014 4:16 PM
Big Dan from Qu...

Posts: 5
Registered: 08/27/12
Re: Eurovan alternator charging between 13.5 and 14.6V, is it normal?
Posted: Jun 5, 2014 4:28 PM   in response to: Francis at Bent... in response to: Francis at Bent...
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Hi Francis,

Thanks for the feedback.

What is very strange is that the last week on a daily usage it's charging always between 14.2 to 14.4.

I will be traveling next weekend for around 1000 km and will see if this is stable.

Regards,
Daniel
Big Dan from Qu...

Posts: 5
Registered: 08/27/12
Re: Eurovan alternator charging between 13.5 and 14.6V, is it normal?
Posted: Jun 9, 2014 12:01 PM   in response to: Big Dan from Qu... in response to: Big Dan from Qu...
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Hi,

Still strange, last Friday I started from home for 400 km, it was charging 14.3/14.4, stop for the weekend, went back home Sunday evening, start the Eurovan, charging at 13.7V almost for the entire 400KM but like 30 mins before arriving home it went to 14.1/14.2 volt until home.

Start it this morning, charging at 14.3.

All batteries are charging well, no issues.

I'm just wondering why the alternator is not always charging at 14.3/14.4 stable?

Regards,
Daniel

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