[T3] Bosch electronic Regulators

Keith Park topnotch at nycap.rr.com
Sat Apr 14 16:37:38 PDT 2012

Well this problem doesn't go away with revving it, only warming it, and it
didn't occur till I put the new electronic regulator in, not with the old

Ill check those field coils but it appears to be a temperature related


Top Notch Restorations
topnotch at nycap.rr.com 
71 Squareback "Hothe"
65 Notchback "El Baja Rojo"
65 Squareback "Eggcrate"
87 golf "Winterat"
93 RX7 "Redstur"

-----Original Message-----
From: type3-vwtype3.org-bounces at lists.vwtype3.org
[mailto:type3-vwtype3.org-bounces at lists.vwtype3.org] On Behalf Of Jim Adney
Sent: Friday, April 13, 2012 11:23 PM
To: type3 at vwtype3.org
Subject: Re: [T3] Bosch electronic Regulators

On 13 Apr 2012 at 12:13, Keith Park wrote:

> Well for a while now ive had the glowing generator light on the cold
> mornings, that went away as things warmed up but this morning, the car was
> in the garage, sitting for a week or so, about 40 degree's and It started
> with a bright red generator light.  It wasn't charging, 12.3V, even when
> revved a little. 

I've seen this happen even with the OE style regulators, so it's not 
clear to me that this is even a regulator problem. On the cars where 
I've seen it, it would go away if you just raised the rpms medium to 
high. Normal driving, running thru the gears seems to do it.

In the case I worked on, I think I finally decided that the fault was 
in the generator, possibly some shorted turns in the field winding, 
meaning that it took more field current to make the same amount of 
field. You could check the resistance of your field coils. They 
should measure 4-4.5 Ohms. If they measure low, you could take the 
generator apart and measure the 2 halves separately. They should 
measure the same.

Jim Adney, jadney at vwtype3.org
Madison, Wisconsin, USA

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