[T3] Batteries.

William Jahn willjahn975 at gmail.com
Fri Nov 16 10:08:31 PST 2018

Thanks Jim, I finally have confirmation that they do draw something. I imagine since mine draws close to 10 times as much and I see three diodes , perhaps one is allowing a small about of current to leak past. I can’t say I’ve run across diodes that partly fail and I have no idea what is in the reg’s base . I know I read the meter right . 


Sent from Mail for Windows 10

From: Jim Adney
Sent: Friday, November 16, 2018 7:16 AM
To: type3 at vwtype3.org
Subject: Re: [T3] Batteries.

On 5 Jul 2018 at 13:32, William J wrote:

>  I checked for a parasitic draw and found 5 mA , isolated it between the
> battery + red/white lead to the voltage reg B+ I removed the other
> red/white to fuse box off reg B+  during test . It's not much of a drain
> and I can only determin it's the Bosch electronic regulator

I finally got around to checking this with some of the new style Bosch solid 
state voltage regulators that I have here in stock. I found one to draw 0.54 
mA and a second one to draw 0.57 mA. That's with a battery that's sitting 
with ~12.6 V on it.

That appears to be by design, and it's not much. It's probably less than the 
self discharge rate of the battery. At that rate, it would take more than a year 
to drain 5 AHr out of the battery.

I can't explain why the current I measure is only ~10% of what William 

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

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