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nova73
Samba Member
Joined: March 31, 2011
Posts: 117
Location: Akron,PA 17501
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 Posted: Wed Jul 23, 2014 6:35 pm Post subject: Battery/O2 sensor lights |
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I've had my battery disconnected several times in the past several weeks and now the Battery/O2 lights in the dash are on and won't go out. Any suggests on how to eliminate them. My engine starts and runs great. No problems.
Nova73
85 Weekender
Akron ,PA |
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fixedgear
Samba Member
Joined: November 09, 2006
Posts: 300
Location: Clear Lake, Manitoba, Canada
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| Posted: Wed Jul 23, 2014 6:54 pm Post subject: |
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It could be one of those coincidences that will drive you mad:
The O2 light is just a service reminder to change the sensor I think every 60K miles. The fix is to drop the spare/clamshell and stick a pen or something in the speedometer box reset hole.
The battery light may be loose or corroded connectors on the battery posts, or a loose alternator belt.
That they would appear at the same time is just a test on your sense of humour and aggravation tolerance.
_________________
1986 Wolfsburg Weekender |
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ohhorob
Samba Member
Joined: September 26, 2013
Posts: 212
Location: Santa Cruz
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| Posted: Wed Jul 23, 2014 9:31 pm Post subject: |
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This has happened to me recently. The blue wire at the alternator was the cause.
Try this thread – http://www.thesamba.com/vw/forum/viewtopic.php?p=6257153#6257153
| crazyvwvanman wrote: |
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The alternator has a small blue wire connecting to it that comes from the alt warning led on the dash. Your problem is most likely caused by a bad connection on the blue wire or the blue wire may be broken or may have fallen off at the alternator end. Look at the alternator and check the small blue wire to see if it is connected and solid looking at the connection.
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_________________
"Gundy" - '85 Westfalia
GoWesty 2300cc, Digijet |
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nova73
Samba Member
Joined: March 31, 2011
Posts: 117
Location: Akron,PA 17501
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| Posted: Thu Jul 24, 2014 7:12 am Post subject: Battery/O2 Lights |
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Blue wire @ alternator was the cause. Thanks for all the comeback information. As always, greatly appreciated. Problem solved.
Nova73
Akron, PA |
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ecopreneur
Samba Member
Joined: August 16, 2012
Posts: 18
Location: Georgia
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| Posted: Tue Aug 27, 2019 1:29 pm Post subject: Re: Battery/O2 sensor lights |
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where is the blue wire on the alternator? I have a brown wire on top by itself and several main wires wrapped together going into the alternator a the black plastic connector. The brown wire on top goes to a crimp connection (crimp it to attach). The others seem to be a plug. Thanks
1984 vw vanagon camper |
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jlrftype7
Samba Member
Joined: July 24, 2018
Posts: 3582
Location: Chicago
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| Posted: Tue Aug 27, 2019 3:44 pm Post subject: Re: Battery/O2 sensor lights |
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| ecopreneur wrote: |
where is the blue wire on the alternator? I have a brown wire on top by itself and several main wires wrapped together going into the alternator a the black plastic connector. The brown wire on top goes to a crimp connection (crimp it to attach). The others seem to be a plug. Thanks
1984 vw vanagon camper |
. Someone may have spliced a repair wire in the last few inches of it, as the wire takes a beating with movement from shaking Altns and just age( insulation gets crumbly)
It ends up , I believe ,going to the black plastic box on the left side( electrical junction box)
_________________
'68 Westy- my first VW and vehicle/Bus- long gone.- sold it to a traveling Swiss couple....
'67 Type 3 Fastback, my 2nd car- gone
'69 Semi-Auto Stick Shift Beetle-gone
2017 MINI Coopers, our current DDs
‘84 Tin Top - Hilga....Auto |
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kamzcab86
Samba Moderator
Joined: July 26, 2008
Posts: 7924
Location: Arizona
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| Posted: Tue Aug 27, 2019 4:01 pm Post subject: Re: Battery/O2 sensor lights |
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| ecopreneur wrote: |
| where is the blue wire on the alternator? |
Blue wire goes to the D+ terminal:
(borrowed pic)
_________________
~Kamz 
1986 Cabriolet: www.Cabby-Info.com
 1990 Vanagon Westfalia: Old Blue's Blog
2016 Golf GTI S
"Real knowledge is to know the extent of one's ignorance." - 孔子 |
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MrCarpy
Samba Member
Joined: September 02, 2020
Posts: 10
Location: Rigaud, QC, Canada
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| Posted: Thu Jun 30, 2022 7:52 am Post subject: Re: Battery/O2 sensor lights |
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| kamzcab86 wrote: |
| ecopreneur wrote: |
| where is the blue wire on the alternator? |
Blue wire goes to the D+ terminal:
(borrowed pic) |
Just recently changed my alternator. Can anyone tell me what is the grey wire with the connector that is bolted vertically to the right? there are 3 pins inside if we remove the cap.
Thanks! |
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dhaavers
Samba Member
Joined: March 19, 2010
Posts: 7757
Location: NE MN (tinyurl.com/dhaaverslocation)
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| Posted: Thu Jun 30, 2022 7:54 am Post subject: Re: Battery/O2 sensor lights |
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Defunct factory diagnostic plug, currently serves no purpose.
- Dave
_________________
86 White Wolfsburg Westy Weekender
"The WonderVan"
<EDITED TO PROTECT INNOCENT PIXELS> |
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MrCarpy
Samba Member
Joined: September 02, 2020
Posts: 10
Location: Rigaud, QC, Canada
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| Posted: Thu Jun 30, 2022 8:12 am Post subject: Re: Battery/O2 sensor lights |
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| dhaavers wrote: |
Defunct factory diagnostic plug, currently serves no purpose.
- Dave |
thanks for the quick reply! kind of what I was guessing. more search i see there are other threads here. Its the TDC plug. |
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