intermittent charge issue

feelstranger feelstranger at
Mon Aug 24 06:16:53 PDT 2009

Thanks for the replies all.
After more testing, things still point to bad alt, which appears less than 
unusual.  Time to call in a replacement.

From: "Bernie Benz" <b.benz at>
Sent: Saturday, August 22, 2009 7:14 PM
To: "Geraint Lloyd" <geraintlloyd_qc at>
Cc: "200q20V mailing list" <200q20v at>
Subject: Re: intermittent charge issue

> Geraint,
> The blue wire is not/ does not supply alternator field coil current.
> It is a ground source for the no charge idiot light when the
> alternator is not supplying voltage to its rectifier array. As such,
> it is an initial mA current source to the stator windings which may
> or may not be necessary to trigger initial voltage build up,
> depending upon the residual magnetism of the rotor.
> I have found the problem in one such alternator as being a poor
> crimped connection in the stator winding 3 phase  “Y“ connection.
> Soldering solved the problem.
> Bernie
> On Aug 21, 2009, at 9:51 AM, Geraint Lloyd wrote:
>> Is it not charging at all or just not charging enough?
>> Had an 18 month old recon one fail with what must have been a short
>> in the
>> exciter coils It was drawing 280mA as opposed to the <150mA-ish
>> that it was
>> supposed to through the blue wire. It was charging, but not enough
>> to keep
>> up with the drain of the AC, rad fan and monster, monster
>> headlamps.......
>> New voltage reg made no difference. I now have a spare for the Golf2
>> Have had new stuff not respect the "excellence comes as standard"
>> rule and
>> fail out of the box, but that was more Lucas than Bosch. Nothing is
>> impossible...
>> I assume that you have checked or replaced the blue wire to the
>> connector on
>> the chassis rail by the water bottle?
>> Also i once managed to install a voltage reg on the 200 using the
>> wrong set
>> of threaded holes on the back of the alternator meaning that the
>> brushes too
>> far away from the slip rings... Moral: use a good flashlight if you
>> are
>> doing it with the car on its wheels in the dark........
>> Geraint
>> -----Original Message-----
>> From: 200q20v-bounces at [mailto:200q20v-
>> bounces at] On
>> Behalf Of feelstranger
>> Sent: 21 August 2009 11:46
>> To: 200q20v at
>> Subject: intermittent charge issue
>> Folks, I'm experiencing an intermittent charge with a newly
>> installed Al179x
>> alternator.  (Bosch remanufactured)
>> Primarily after some time on the highway - and then after "cooling
>> off" for
>> a while (on the side of the road, or rest area) it works for some
>> time -
>> though that seems to be getting more variable.
>> Swapping the voltage reg. had no change, and I confirmed that there
>> was no
>> charging  after the warning light came on.
>> Anyone ever have a faulty "new" alternator?
>> Could it be something else?   I'm relatively confident it is not an
>> intermittent igniter circuit.
>> Thanks
>> Nat
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