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Go Back   TDIClub Forums > TDI Model Specific Discussions Areas > VW MKV-A5 Golf/Jettas

VW MKV-A5 Golf/Jettas Discussions area for A5/MkV Jetta/Golf (2005/2006 PD and 2009 CR).

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Old December 14th, 2017, 09:42   #16
zortmo
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Join Date: Aug 2009
Location: Ga
TDI(s): 99, 01, 06
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Wow Dan, thanks! Going in my notes.

The new alternator seems to have fixed the issue. It's been on the road for two days and it's all good so far. I re-scanned and only 1 significant error with auxiliary heater. I found a thread on fixing so that will happen soon.

Apparently the old alternator was charging fine at idle but at highway speeds the charge was dropping such that various components were seeing a low voltage condition.

Thanks so much for the help. I'll update this thread if anything changes.

Mike
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Old December 14th, 2017, 11:01   #17
DanG144
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Location: Chapin, South Carolina, USA
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Glad to hear the issue appears resolved.

I have one more data point, an apparently well running V6 Tahoe, with a very old very weak battery (would not start on cold mornings any more) was reading about .050 vac or 50 mvAC rms of ripple.
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Old December 15th, 2017, 06:15   #18
zortmo
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Dan, I'm not the sharpest tool in the shed. Having established that, my thinking process on the Tahoe would be replace the battery (it's old and it's winter time). Next I would be looking at waveforms from the alternator, looking at that slightly high AC ripple. I would observe it at idle as well as 2k+. As we discussed earlier I would look at voltage drop from Bat+ to Alt+ and Bat- to Alt housing and Bat- to chassis ground.

That sound right? Thanks again for all your help! Merry Christmas!
Mike
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Old December 15th, 2017, 13:54   #19
DanG144
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He replaced the battery, it was really old. It has been running fine since then.

Next time I am here when he comes by I will check the ripple again. I was really just posting the number here as a cache. If I do get an update, I will post it here as well.

I don't have a real O'scope, but I bought a DS202 miniscope, which has been very helpful on automotive issues. It is made from surplus small smartphone parts, is delicate, but it does work.

Otherwise I would not have any type of oscilloscope.

Dan
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