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Batt dead after sitting for a week

 
Old 06-03-2013, 04:48 PM
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Ducman82
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Default Batt dead after sitting for a week

battery is good, (exchanged anyway, pays to know the part dude). car had trouble cranking after sitting for a week. battery charger for 10 min on 12v/6amp did the trick. full charge later that day off the battery maintainer.

used the volt meter between the positive cable and the positive terminal, got a reading of .08 amp draw..... no amp or stereo issues, no lights on.....

hummmmmmmm where do start?
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Old 06-03-2013, 04:50 PM
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Leon Speed
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Start by pulling one fuse at a time, then relays.
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Old 06-03-2013, 05:04 PM
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red courtesy lights in the doors - bad door switch, maybe....
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Old 06-03-2013, 05:07 PM
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Hovers around this..... I'll give that a shoot tonight. Thanks
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Old 06-03-2013, 05:45 PM
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Second thoughts - 80 mA is around a 1 watt lamp, which would probably rule out the door lamps - more like a dash lamp, clock or 'keep alive' on the radio.
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Old 06-03-2013, 06:03 PM
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Hummmm.... From what I read 100ma is " standard for keep alive/clock/head unit ". Maybe it's fine......
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Old 06-03-2013, 06:26 PM
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take the IR gun and after the car has sat for 1/2 an hour,
go shoot the CE panel any relay or fuse that is hotter than the rest should be investigated
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Old 06-03-2013, 06:31 PM
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Originally Posted by Mrmerlin View Post
take the IR gun and after the car has sat for 1/2 an hour,
go shoot the CE panel any relay or fuse that is hotter than the rest should be investigated
BRILLIANT!
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Old 06-03-2013, 06:34 PM
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Nice! I will hook the batt back up and wait a bit and try that...
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Old 06-03-2013, 06:51 PM
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Check all fuses. Nothing. Then I remembered the Sirius antenna /alpine interface box thing. Unhooked that. Dropped .06... !!! Down to .01. Think I found it...

What's normal anyway?
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Old 06-03-2013, 07:12 PM
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Normal 30-35ma.
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Old 06-03-2013, 09:10 PM
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With that Sirius box un hooked, 15.3ma. Now the ma fuse blew . Went to radio shack to get another ,

One thick filament is the unit in the meter T315ma250v
The invisible filament is the radio shack 315ma250v. It blows just turning the damn meter on...... I need to find this super nice fuse.... Ugh
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Old 06-03-2013, 09:57 PM
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Is the sirius box hooked up right? it should have a switched supply I'd think?

@ ~15ma you are doing very good

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Old 06-03-2013, 10:36 PM
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Yup, direct to battery. Per the diagram. 80ma, was as high as I could get during testing. That still seems low. I'm hoping to upgrade my head unit soon, ditch the external alpine Sirius interface pile.....
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Old 06-04-2013, 05:57 AM
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Messing with my wife's Lincoln, draw on the battery at idle was -56 amps, initial key off 2.5 amps, 30 sec drops to about 50 ma, five min or so 17 ma, bit over half an hour 1 ma or less.

I forget how long it is before the brain goes fully asleep on the 928, but I did come up with the idea of using a spare hatch lock so I can leave the hatch open during testing. For now I use a battery disconnect on the ground strap.

DC clamp meter is a handy item, good ones are expensive, but the Craftsman 82369 will zero down to about 10 ma and goes on sale around $60.
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