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Subject Author Date
Car current draw ransley 01-31-2008
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Posted by Stormin Mormon on January 31, 2008, 9:12 pm
Maybe my clamp on ammeter is defective. It doesn't specify 120 volts. I've
been using it on both 110 and 220. Maybe if I have to read 220, I need to
cut the amp reading in half?

You'll have to go to the auto parts store, and buy a 12 volt clamp on AC
ammeter.

Buy a new battery, and quit wasting our time.

--
Christopher A. Young
Learn more about Jesus
www.lds.org
.


What should the current draw be with a car parked, for the night, not
running, Volvo v40 with factory alarm but never activated. How do you
check this. In the morning my battery is low. Can I use a 120v digital
clamp on amp meter.



Posted by Joseph Meehan on February 1, 2008, 7:22 am
I believe the problem is AC current vs DC current.

--
Joseph Meehan

Dia 's Muire duit



> Maybe my clamp on ammeter is defective. It doesn't specify 120 volts. I've
> been using it on both 110 and 220. Maybe if I have to read 220, I need to
> cut the amp reading in half?
>
> You'll have to go to the auto parts store, and buy a 12 volt clamp on AC
> ammeter.
>
> Buy a new battery, and quit wasting our time.
>
> --
> Christopher A. Young
> Learn more about Jesus
> www.lds.org
> .
>
>
> What should the current draw be with a car parked, for the night, not
> running, Volvo v40 with factory alarm but never activated. How do you
> check this. In the morning my battery is low. Can I use a 120v digital
> clamp on amp meter.
>
>

Posted by Chris Lewis on February 5, 2008, 3:24 pm
> I believe the problem is AC current vs DC current.

I don't really know whether the usual retail/consumer grade
clamp-on meters will do DC. But the ones that auto mechanics
use _will_ do DC readings. I've watched one in use testing
a battery/charger - they're not AC only.

These meters don't care what voltage they're measuring. All they
know is magnetic field strength around an individual wire,
and that depends solely on current, not what the voltage is to some
other wire that's arbitrarily far away.
--
Chris Lewis,

Age and Treachery will Triumph over Youth and Skill
It's not just anyone who gets a Starship Cruiser class named after them.

Posted by Joseph Meehan on February 5, 2008, 7:21 pm
The more I think about it, the more I believe you are correct.

--
Joseph Meehan

Dia 's Muire duit



>> I believe the problem is AC current vs DC current.
>
> I don't really know whether the usual retail/consumer grade
> clamp-on meters will do DC. But the ones that auto mechanics
> use _will_ do DC readings. I've watched one in use testing
> a battery/charger - they're not AC only.
>
> These meters don't care what voltage they're measuring. All they
> know is magnetic field strength around an individual wire,
> and that depends solely on current, not what the voltage is to some
> other wire that's arbitrarily far away.
> --
> Chris Lewis,
>
> Age and Treachery will Triumph over Youth and Skill
> It's not just anyone who gets a Starship Cruiser class named after them.


Posted by Edwin Pawlowski on January 31, 2008, 9:36 pm

> What should the current draw be with a car parked, for the night, not
> running, Volvo v40 with factory alarm but never activated. How do you
> check this. In the morning my battery is low. Can I use a 120v digital
> clamp on amp meter.

How old is the battery? It may not be the parasitic draw, it may just be
the battery slowly heading south. You can try disconnecting the battery and
see if it is weak in the morning. If so, replace it.



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