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Generator/Regulator test help
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David Follett
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Joined: May 10, 2010
Posts: 99
Location: Media, PA
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PostPosted: Tue Aug 03, 2021 4:34 am    Post subject: Generator/Regulator test help Reply with quote

I put a new type Bosch voltage regulator on my '69 Ghia that has a generator. When I connected the battery the generator got hot at the brush area. Engine is not ready to start yet to test output at generator or regulator. I have 12 volts at the regulator B+ which is connected to the battery and also 12 volts at the D+ which is connected to the generator. I cannot find information about a regulator test other than output from the generator and nothing about testing or checking the 4 regulator connectors for positive or negative readings.
Why is there a 12 volt reading at my D+ ? I would think there would be voltage there only when the generator is turning.
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Present VW-'69 Ghia Coupe
Former VW's & a few others:
Type 1-'69 Type 1 Rat Rod, '69, '63, '60, '62, '55?? split window in Germany, US Army 1964-66, '64 Baja Bug w/1500S Type 3 engine. Ghia '62, '66.
Type 2- '67 Dual Cab
'?? Vanagon
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rcooled
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Joined: September 20, 2008
Posts: 2491
Location: Santa Cruz, CA
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PostPosted: Tue Aug 03, 2021 10:24 am    Post subject: Re: Generator/Regulator test help Reply with quote

You may need to wait 'till you can run the motor to fully troubleshoot the charging system. Here's some info to get you started: http://www.vw-resource.com/generator.html

Check to make sure all the wiring is connected properly. This is a wiring diagram for a '69 Ghia: https://www.thesamba.com/vw/archives/info/wiring/ghia_67_USA.jpg
_________________
'63 Ragtop (current)
'65 Ghia coupe (totaled)
'67 Ghia convertible (current)
'69.5 Ghia convertible and
'62, '63, '65, '69 Bugs (all long gone)
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David Follett
Samba Member


Joined: May 10, 2010
Posts: 99
Location: Media, PA
David Follett is offline 

PostPosted: Tue Aug 03, 2021 12:43 pm    Post subject: Re: Generator/Regulator test help Reply with quote

Thank you. Very helpful information. Just removed a T4 engine and getting the 1600 back together so may be awhile to properly test.
I did the generator test briefly and it does motor.
Still not sure why there is 12 volts at the generator when it is not turning with fan belt.
If someone could test theirs and there is not 12 volts there I believe my regulator is bad and I can get one in the mean time.
_________________
Present VW-'69 Ghia Coupe
Former VW's & a few others:
Type 1-'69 Type 1 Rat Rod, '69, '63, '60, '62, '55?? split window in Germany, US Army 1964-66, '64 Baja Bug w/1500S Type 3 engine. Ghia '62, '66.
Type 2- '67 Dual Cab
'?? Vanagon
412 wagen
Dasher wagen
Jetta-GLI, VR6, Golf
TR2,TR3, Austin Healy 3000, MGTD, Porsche Speedster & 3 Model A Fords. Almost forgot-Corvair & Nash Mertopolitan
Back to top
View user's profile Send private message Send e-mail Gallery Classifieds Feedback
rcooled
Samba Member


Joined: September 20, 2008
Posts: 2491
Location: Santa Cruz, CA
rcooled is offline 

PostPosted: Tue Aug 03, 2021 8:16 pm    Post subject: Re: Generator/Regulator test help Reply with quote

David Follett wrote:
I believe my regulator is bad...

If everything's wired up correctly, and you have 12V at D+ with the motor off, you're right about that regulator. Probably frozen contacts somewhere inside.
_________________
'63 Ragtop (current)
'65 Ghia coupe (totaled)
'67 Ghia convertible (current)
'69.5 Ghia convertible and
'62, '63, '65, '69 Bugs (all long gone)
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View user's profile Send private message Gallery Classifieds Feedback
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