[T3] I don't know why yet for some reason my 73T3chargingsystemseems off.

[Keith Park]

15ma or so is no problem, my radio does that in the square and the
interstates last almost 10 years.

Keith


Topnotch Restorations
topnotch at nycap.rr.com
http://www.a383ina68.addr.com/radiorest/main.htm
71 Squareback  "Hothe"
65 Notchback  "El Baja Rojo"
93 RX7  "Redstur"
87 Golf  "Winterat" RIP
01 Sentra SE "Boremobile"
 

-----Original Message-----
From: type3-vwtype3.org [mailto:type3-vwtype3.org-bounces at lists.vwtype3.org]
On Behalf Of William J
Sent: Sunday, July 02, 2017 1:13 PM
To: type3 at vwtype3.org
Subject: Re: [T3] I don't know why yet for some reason my
73T3chargingsystemseems off.

 I didn't add any water to it. I had close to an 9 mA draw which was the 
modern radio memory  actually 1.4 mA of the draw was between the battery + 
and reg + the red /white heavy gauge wire with the double  red/ white that 
feeds the car fuse box and all else I had unplugged to isolate the slight 
draw. At that time I added a switch to  disconnect the radio and recall 
flipping it back on a few months ago I used fuse # 9 on my 73 SB for the 
radio because I needed hot all the time for the radio memory and the radio 
has a built in switch so it can be turned off without an acc ign position 
and I also have a 12 volt relay to power the three added volt. temp and oil 
.

 I have this written down because I did it so long ago I forgot . I know the

relay does not stick  or the added gauges would stay on . Key on powers the 
relay coil off fuse #12 to engage it's contact. feeding power to the gauges 
..

 The engine cranks over fine. I'll need to check the draw a again can't 
recall where is came up with the 1.4 mA draw on the regulator I have one 
note book with most info and another with the notes I made checking the draw

which I can't find. I think it was less than 1.4 mA it's a Bosch electronic 
unit. and calling bosch they could not tell me anything as to if normal or 
not they don't know how it even works.
----- Original Message ----- 
From: "Jim Adney" <jadney at vwtype3.org>
To: <type3 at vwtype3.org>
Sent: Saturday, July 01, 2017 6:41 AM
Subject: Re: [T3] I don't know why yet for some reason my 73T3chargingsystem

seems off.


> On 30 Jun 2017 at 19:39, William J wrote:
>
>>  Here's the thing . last July I returned one interstate MT-42 becuase 
>> when I
>> called interstate I was told by one rep the voltage should be higher than
>> the 12.67 standing  volts .
>
> It would also be helpful to understand that the fully charged standing 
> voltage
> depends on the folowing:
>
> 1) the temperature of the battery
>
> 2) the uniformity of the battery temperature (side to side, top to bottom 
> etc.)
>
> 3) the exact concentration of the battery acid, so it depends on whether 
> you
> have added or not added water to it
>
> 4) how long it has been sitting since it was last charged
>
> 5) The battery plate chemistry
>
> 6) How clean it is, including surface films that may not be visible. 
> (Affects the
> rate of self-discharge.)
>
> Plus there's always the accuracy of your voltmeter. Digital voltmeters 
> tend to
> make us assume that they are as accurate as the display, but that's not
> usually a safe assumption.
>
> There are probably more variables, but each of these things has a small
> effect, so that there's no point in worrying about differences of a couple
> tenths of a volt. Actual problems in a battery usually result in a change 
> of ~2
> V or no change in resting voltage but a huge increase in internal 
> resistance.
>
>>  I do have an issue with over thinking things.
>
> That may be what's happening here.
>
> -- 
> *******************************
> Jim Adney, jadney at vwtype3.org
> Madison, Wisconsin, USA
> *******************************
>
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