[DML] Re: power drains....

["David Teitelbaum" <jtrealty@xxxxxxxxxxxxx>]

To test an alternator you use a carbon pile. To load test a battery
all you need is a variable resistance load. Most service stations have
such a device. To test a battery's state-of-charge you MUST put a load
on it to remove any surface charge and to see how fast the voltage
drops in relation to the load. What you are really measuring is
amp/hours referencing the voltage to a known ampere load. You cannot
just stick a voltmeter on a battery and from that reading tell if it
is any good.
David Teitelbaum
vin 10757



--- In dmcnews@xxxxxxxxxxxxxxx, "John Hervey" <john@...> wrote:
>
> David, 
> Did I say anything about Amp's. I was talking about battery
condition and
> it's state of charge. 
> If you want to test the current / amps condition of the battery the
correct
> way you need to find someone that has a carbon pile tester. There
expensive
> so you may have to call around to find someone that has it.
> John Hervey
> www.specialtauto.com
> 
> 
> 
> -----Original Message-----
> From: dmcnews@xxxxxxxxxxxxxxx [mailto:dmcnews@xxxxxxxxxxxxxxx] On
Behalf Of
> David Teitelbaum
> Sent: Thursday, August 02, 2007 8:34 PM
> To: dmcnews@xxxxxxxxxxxxxxx
> Subject: Re: [DML] power drains....
> 
> You cannot infer from a simple voltage reading what the ampere
> capacity of a battery is. It takes a load test to determine that. Most
> places will do it for free in the hopes of selling you a battery. If
> you let a new battery go completly dead several times you may have
> killed it. Lead-Acid batteries do not take kindly to being completely
> discharged.
> Pull all of the fuses. Put an ammeter in series with the battery.
> Install the fuses one-at-a-time and watch the ammeter. When it jumps
> up you will know which circuit is the problem. A battery Master Switch
> is also useful.
> David Teitelbaum
> vin 10757
> 
> 
> 
> --- In dmcnews@xxxxxxxxxxxxxxx, "John Hervey" <john@> wrote:
> >
> > Andy, 
> > 12.66 volts the battery is at 100%, 12.5 volts the battery is at
> 80%, 12.2
> > volts the battery is at 40%. That's why at 12.2 volts it most likely
> won't
> > start.
> > John Hervey
> > www.specialtauto.com
> > www.deloreanautoparts.com
> > 
> > 
> [moderator snip]
> 
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