[T3] Bosch electronic Regulators

Jim Adney jadney at vwtype3.org
Fri Apr 13 20:23:18 PDT 2012

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 up
> 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

More information about the type3-vwtype3.org mailing list