What Allen said.
Ordinarily you shouldn't see any (significant) voltage
at D+ with the regulator disconnected - the regulator
controls the current flow through the field windings
(via the DF terminal) which determines the output
voltage of the generator. If the field is shorted
directly to ground at the DF end you'll get maybe 35
volts at B+; on this one it sounds more like there's a
short between the field and main windings - it would
lead me to take it back to the rewinder.
The last few paragraphs here describe how you can test
a generator. Not directly helpful for this one because
of its unusual problem, but it should help you
understand how the system works:
http://www.vw-resource.com/generator.html
--- "[EMAIL PROTECTED]" <[EMAIL PROTECTED]> wrote:
> Asad,
>
> I'm not an electrician but I agree that positive
> from BOTH the DF and D+
> does not sound correct. I believe that when you
> flash a generator to make
> certain the polarity is coprrect you connect the
> positive and negative
> terminals of the battery to the generator termonals.
> Getting +15 volts from
> both terminals just doesn't sound correct and that
> may also be what is
> causing his generator to become so hot.
>
> Allen C. - Byron, GA
> 74 Ghia Coupe
>
> Original Message:
> -----------------
> From: asad ishaque [EMAIL PROTECTED]
> Date: Wed, 14 Nov 2007 14:36:45 +0000
> To: [EMAIL PROTECTED]
> Subject: [vintagvw] 69 Bug generator probs.
>
>
>
> Hi all,
>
> Again asking a question for a friend. He has a
> 69 bug which he is
> converting to a buggy. Had charging issues. Got a
> lot of bad advice from
> local mechanics and electricians. Ended up getting
> his generator rewound.
> Now what he posts to me:
>
> Quote:
>
> ''Well the problem is ... With No Connections and
> running engine, I am
> having +15(Varying) voltages on DF terminal of my
> dynmo, and -15(varying)
> voltages on D+ terminal of my dynmo.It should give
> +15(varying) voltages on
> both D+ and DF terminals.Any guys having same kind
> of dynmo can solve this
> issue for me, all they need to do it, temporarily
> disconnect DF and D+
> terminals from their dynmo and use VoltMeter to
> check voltages on DF and D+
> terminals while engine is running.Also to check what
> degree the dynmo heats
> up with connection and without connection to cutout
> and related
> assembly.Hopefully these checks and tests help me to
> resolve my isssue.''
>
> End quote.
>
> Second prob he was facing is that the gen heats
> up to the point that
> he cannot keep his hand on the housing for longer
> than 5 secs. What could
> be the issue apart from what I asked him to check,
> namely:
>
> 1.Worn gen bearings.
> 2.Missing cooling plate in the fan housing.
> 3.Maybe its due to the fact that the gen is not
> connected to the wiring???
>
> Havent spoken to him since he sent me the above
> text but I think I
> dont agree with the getting positive voltage at both
> D+ and DF terminals.
> I did advise him to get an opinion from the
> person who had rewound the
> gen.
>
> Any help would be appreciated.
>
> Asad.
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