Alternator ailments resolved

Bernie Benz b.benz at
Tue Jul 3 09:48:21 EDT 2007

Not true, IMO, Ken.

The regulator is a voltage regulator, not a current regulator. Thus,  
under high current demand the system voltage drops and the regulator  
responds with the field current required to maintain the set point  
voltage, at which the alternator will be providing the current  
demand. The only regulator discrepancy is that its temperature  
compensation is within the regulator and not at the remote battery  
location, but not a serious problem.


On Jun 29, 2007, at 11:57 AM, Kenneth Keith wrote:

> I have read the claim that the upper limit of voltage on the Bosch
> regulator is too low to allow it to catch up or keep up with periods
> of high demand (such as the radiator fan on full blast forever here in
> the AZ summer heat, with other accessories on).  One such claim was
> made on a website offering the external regulator conversion, so that
> source is obviously not unbiased.  Here's one that isn't a commercial
> page:
> I have noticed how warm the alternator and air shroud area can get,
> which is quite warm given it's proximity to the turbo.  Maybe the
> claim that high temperature adversely affects output is baseless.  I
> haven't tried the external conversion yet, but I still find it
> interesting.
> Ken
> On 6/29/07, Bernie Benz <b.benz at> wrote:
>> The regulator is mounted on the cold, intake air end bell of the
>> alternator, no heat problem with the stock input air shroud in place.
>> The Bosch regulator does an optimum job, within the constraints of
>> possible poor connections and grounds.
>> Bernie
>> On Jun 29, 2007, at 10:18 AM, Kenneth Keith wrote:
>>> Or alternator brushes on the voltage regulator, since it is also the
>>> brush holder in these particular ones, as opposed to other apps or
>>> conversions that have an external VR and separate brush holder.
>>> Anyone do the external VR conversion, by the way? Seems like it  
>>> might
>>> help to get it away from the hot alt, and also supposedly  
>>> provides for
>>> a higher voltage to catch up better than the stock Bosch one.
>>> Ken
>>> Kneale Brownson <knealeski at>
>>>> Voltage regulator brushes on the alternator, Grant.  I guess those
>>>> could be called the alternator brushes.
>>>> Grant Lenahan <glenahan at> wrote:  Regulator brushes?
>>>> I'm lost. You mena alternator brushes??
>>>> Grant
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