Battery drain

[John Cody Forbes]

I generally go to .3 amps or less. I've seen just a radio draw about .15A by itself then add ECU's and the clock etc. 

-Cody (mobile)

On Aug 21, 2010, at 6:27 PM, Grant Lenahan <glenahan at vfemail.net> wrote:

> i think even that is high.  With the car and accessories off, i would expect less than a watt total, which is 0.08A (80 mA) at 12V.
> 
> Less on any one fuse
> 
> All you should be doing is keeping a few memory devices live.
> 
> Grant
> 
> 
> On Aug 21, 2010, at 5:54 PM, Henry A Harper III wrote:
> 
>> 
>> I would guess that a net draw of any more than a few hundred milliAmps (say
>> 0.2-0.5 Amp) will drain a battery fairly quickly.
>> 
>> -----Original Message-----
>> From: dgraber460 at aol.com [mailto:dgraber460 at aol.com]
>> Sent: Saturday, August 21, 2010 3:47 PM
>> To: hah at alumni.rice.edu; quattro at audifans.com
>> Subject: Re: Battery drain
>> 
>> 
>> Thanks a bunch for the response.
>> Its quite a spark at hook up. More than should be. I have had a battery
>> hydrogen flash (explode) on me before so I am very careful about that.
>> What amp flows am I looking for? What is normal and what is "found the
>> bastard!".
>> 
>> 
>> Dennis
>> Denver
>> 
>> 
>> -----Original Message-----
>> From: Henry A Harper III <hah at alumni.rice.edu>
>> To: dgraber460 at aol.com; quattro at audifans.com
>> Sent: Sat, Aug 21, 2010 3:32 pm
>> Subject: RE: Battery drain
>> 
>> 
>> 
>> What you are looking for is *current* flow through the DVM, between the
>> battery post and harness terminal normally on the post. Set DVM to measure
>> Amps. You may need to change where one of the DVM wires plugs in. You may
>> notice a limitation/warning printed  on the DVM of say 10 Amps before you
>> blow a fuse inside the DVM, in that case be careful not to do anything in
>> the car that will take that much power - interior lights will probably be
>> fine, but headlights and A/C would be too much.
>> 
>> Meauring 11.7 Volts across the gap between battery post and harness terminal
>> is about what you'd expect from a flat battery. How much of a spark does it
>> make when you hook it back up (in a well-ventilated area of course)?
>> 
>>> -----Original Message-----
>>> From: quattro-bounces at audifans.com
>>> [mailto:quattro-bounces at audifans.com]On Behalf Of dgraber460 at aol.com
>>> Sent: Saturday, August 21, 2010 3:19 PM
>>> To: urq at audifans.com; quattro at audifans.com
>>> Subject: Battery drain
>>> 
>>> 
>>> 
>>> Well one of my worst nightmares has apparently come to pass.
>>> My battery goes flat after ~ 12 hours. I had the battery checked
>>> this morning and they said it needed a charge but was not the
>>> problem. I'm not totally convinced by their testing method, but whatever.
>>> I remember seeing a post about taking the battery post off, and
>>> checking the power drain across the post and cable with a DVM
>>> with everything turned off, then pulling fuses 1 at a time till
>>> you find the culprit. Is this the method of choice? Am I right
>>> that you measure across the disconnected cable and the post for
>>> voltage drain? What is considered normal here for clock, ecu,
>>> radio, and misc "maintenance".
>>> I'm seeing 11.7 volts across here which tells me something is
>>> _way_ wrong and not a small short to ground. More like leaving
>>> the lights on all day?
>>> Dang - I _hate_ electrical short issues!! I would rather have a
>>> mouth full of root canals than deal with this!!
>>> Patient is an 83 URQ with a 3B motor transplant.
>>> Help!!
>>> 
>>> Dennis Graber
>>> 720-838-0558
>>> _______________________________________________
>>> quattro mailing list
>>> http://www.audifans.com/mailman/listinfo/quattro
>>> http://www.audifans.com/kb/List_information
>>> 
>>> 
>> 
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> 
> Grant Lenahan
> glenahan at vfemail.net
> 
> 
> 
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