what should a battery sit at

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black cavy

Copper - Posts: 78

Joined: July 24, 2006

Location: Ontario, Canada

Posted: March 07, 2009 at 8:46 AM / IP Logged

What should a Battery Sit at Hooked up with an Alarm overnight

I just bought a Brand New Optima Red Top 800CCA-1000C

I drove the car all around yesterday, Since 3:00PM Yesterday I have been going out every 30 Minutes and Reading it.

When I went to bed at 11:30 it was sitting at 12.73V

I just went out today and its at 12.55V a Perfect battery sits at 12.6 Right

Is it normal to Drop one Full Volt with an Alarm Hooked up and Not Armed

I have a Big Current Draw and I'm trying to find it

That’s why I went and bought a Brand new Optima Battery to Start New

When the Car Runs the Battery Reads 15.01V and then only drops to 14.99v

When I turn the car off it reads 13.05 and Seems to Drop from there I guess trying to get to the 12.6V mark

The Coils in the Alt look Burned and Black now and I hear a weird Noise

Could the Regulator Be Bad and while Charging the Battery to 15.01 Volts Be Draining the Battery when Its turned off.

I even Replaced all the Fuses in the Alarm system in the Fall to Lower Amps and still the same thing.

I'm Getting Midas on Monday to do a Charging Test for $23.99 but don't want them to love up my alarm if they put there tester on.

I would really like some Expert Help on this what should a battery sit at -- posted image.

howie ll

Pot Metal - Posts: 16,466

Joined: January 09, 2007

Location: United Kingdom

Posted: March 07, 2009 at 10:21 AM / IP Logged

!2.55 is aceptable after about 10 hours at rest, 15.01 most certainly isn't, your voltage regulator has blown. some of your smaller bulbs should have burned out by now.

black cavy

Copper - Posts: 78

Joined: July 24, 2006

Location: Ontario, Canada

Posted: March 07, 2009 at 11:36 AM / IP Logged

howie ll wrote:

!2.55 is aceptable after about 10 hours at rest, 15.01 most certainly isn't, your voltage regulator has blown. some of your smaller bulbs should have burned out by now.

Do you mean at my Cluster??? inside the car

howie ll

Pot Metal - Posts: 16,466

Joined: January 09, 2007

Location: United Kingdom

Posted: March 07, 2009 at 12:52 PM / IP Logged

Take your readings at the battery, A) It's more accurate and B) You'll lose about .25V between battery poss and where you were doing it. Turn everything off, keys out of car shut doors, wait 2 mins and with hood open, disconnect battery neg, then set up your DMM to the 10amp (or 20 if it has it), position and the probes accordingly, take your neg to the terminal and the pos to the disconnected battery wire. If the alarm is disconnected (fuses out) the average reading should be between 40-70milliamps. Anything approaching 1 amp except on a late Jaguar, BM, Mercedes, Caddy or car of that ilk means something is draining though I still suspect the voltage regulator.

black cavy

Copper - Posts: 78

Joined: July 24, 2006

Location: Ontario, Canada

Posted: March 07, 2009 at 1:12 PM / IP Logged

howie ll wrote:

Thanks what should a battery sit at -- posted image.

Car is a Cavalier 2.4L

I hope to try this on Sunday if it doesn't rain

What Number should I have if I don't pull the Alarm Fuses 1 amp about(I will be doing both ways With Fuses installed and not installed)

About it might being the Alternator Regulator even through the car is Turned off it still can Drain from the Alternator

I always thought the Battery was like a big capacitor and Filters the Ripple AC from the Alternator. I didn't know the Regulator Could Back Feed and take volts from the Battery and kill it.

howie ll

Pot Metal - Posts: 16,466

Joined: January 09, 2007

Location: United Kingdom

Posted: March 07, 2009 at 2:41 PM / IP Logged

Look to about 70miliamps with alarm connected. If set to 10amp range will show as 0.07, no if voltage reg is too high it will cook the battery, bend a vertical plate inside and the battery will fail to take a charge, otherwise your description is correct. Except a cap stores it as current, a battery stores electricity chemically.

i am an idiot

Platinum - Posts: 13,667

This member consistently provides reliable information

Joined: September 21, 2006

Location: Louisiana, United States

Posted: March 07, 2009 at 5:08 PM / IP Logged

What brand of digital meter are you using?

loneranger

Copper - Posts: 572

Joined: December 28, 2008

Posted: March 07, 2009 at 5:58 PM / IP Logged

Capacitors store energy chemically, as well.

Ideal - cmon dude, add to topics in a useful manner, not stuff that is obvious.

Story - Phzzzt! Hey, what happened?! ... Isn't it obvious?

Moral - Never dismiss the obvious.

black cavy

Copper - Posts: 78

Joined: July 24, 2006

Location: Ontario, Canada

Posted: March 07, 2009 at 9:39 PM / IP Logged

i am an idiot wrote:

What brand of digital meter are you using?

I had a Fluke but was Stolen

So I bought a Cheap DMM that looks like this it's 10AMP MAX

what should a battery sit at -- posted image.

i am an idiot

Platinum - Posts: 13,667

Joined: September 21, 2006

Location: Louisiana, United States

Posted: March 07, 2009 at 10:22 PM / IP Logged

Chances are you have a slightly inaccurate meter.

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