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post #1 of 10 Old 07-16-2019, 01:42 AM Thread Starter
emacca
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Location: gold coast, australia
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This is wierd

This morning my battery was flat

A bit of history

I bought this car recently, and have already replaced the battery, the car is stock

And the only thing done is that I replaced the front foot well blue bulbs with
Blue LEDs.

I have however had the car open as I tried to resolve some internal and external squeaks
I generally leave the car unlocked through the day, I have heard that if itís not locked then there is a current drain as computers are on in standby.

I jump started it and
Checked the alternator output at idle and itís 14.5v

Today after doing a 250km round trip all seems good
Battery voltage car turned off and no accessories on is 12.5 measured at the engine bay remote battery posts.

Oh itís a 2011 JGC Laredo export model (Australia)

Any thoughts?

Thanks

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post #2 of 10 Old 07-16-2019, 07:13 AM
ColdCase
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There is a parasitic loss test you can do by connecting an amp meter in series with the battery negative terminal. If you are not comfortable with making amp measurements (easy to burn out the meter) have a pro do it.

Some computers stay on for 10-15 minutes after doors shut before they sleep. But the Radio, Power amp, PCM and CCN will continue to draw power regardless of lock state (I never lock mine when parked in the garage). The remote and passive entry receivers stay awake. The low-amperage IOD should not exceed thirty-five milliamperes, its usually about six milliamperes.

https://www.jeepforum.com/forum/f309...ttery-4361641/

Many times the underhood lamp or one of the interior lights are left on.

I was born with nuttin' and I still have most of it.
Current: 2011 Grand Cherokee Overland V8, 2009 Liberty Rocky Mt V6
Previous: 2000 Grand Cherokee Laredo I6, 1979 CJ7 I6 Quadratrac
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post #3 of 10 Old 07-16-2019, 08:09 AM Thread Starter
emacca
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Thanks for the link, that was what I was looking for
Iíll see what happens in the morning,

If itís low or flat guess Iíll get the trusty meter out and start pulling fuses.

Thanks for your help, itís appreciated
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post #4 of 10 Old 07-16-2019, 08:16 AM
ZEN357
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My mother, who is in her 80's, has a 2013 Chrysler 300C Varvatos Edition. It was my Father's before he passed away. She does not drive it every day so we have to keep it on a trickle charger otherwise the battery goes dead after a few days of none use. The battery is new and everything has been tested good. She just doesn't drive it but maybe once a week to go to church.
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post #5 of 10 Old 07-18-2019, 09:34 PM Thread Starter
emacca
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Ok followed the linked site to the video, very informative

So it seems my car is pulling 1.5 amps at rest doors closed, locked and with me in the back with the negative terminal disconnected and my meter on the 10a scale

I was expecting a much lesser drain, but then I donít know whatís acceptable for this car

Battery havenít gone flat again, but then I have been using it daily

Any thoughts

Anyone want to check current drain on their car

All help appreciated
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post #6 of 10 Old 07-18-2019, 11:21 PM
ColdCase
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Posted above is the 35 ma spec for 2011s after modules sleep (about 10 minutes after the door is shut).

You will have to start pulling fuses to determine whats drawing the power.

I was born with nuttin' and I still have most of it.
Current: 2011 Grand Cherokee Overland V8, 2009 Liberty Rocky Mt V6
Previous: 2000 Grand Cherokee Laredo I6, 1979 CJ7 I6 Quadratrac
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post #7 of 10 Old 07-19-2019, 01:15 AM Thread Starter
emacca
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Yep I know I just wanted someone to tell me itís ok hahaha

I thought seeing as people have reported alternator issues I might start there first

Pain with this car is tha5 unless Iíve missed I there is no door courtesy light switch

So I canít have a door open while doing this testing, also with the hood , otherwise it sets off the alarm

Oh any idea what the small module is on the inner stock tower in the engine bay, with the flashing LED is

In my RHD car itís on the RH inner tower

Thanks
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post #8 of 10 Old 07-19-2019, 08:28 AM
ColdCase
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The door switch is in the latch.

It could be an alarm or security module.... or someone is tracking you . Dunno if the OEM siren has a flashing LED, but its round.

I was born with nuttin' and I still have most of it.
Current: 2011 Grand Cherokee Overland V8, 2009 Liberty Rocky Mt V6
Previous: 2000 Grand Cherokee Laredo I6, 1979 CJ7 I6 Quadratrac
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post #9 of 10 Old 07-20-2019, 09:35 PM Thread Starter
emacca
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Ok I had a bit more time to investigate this ďboxĒ with flashing LED under the hood

It had a power connection to the 12 v post in the fuse box and an earth to frame

Also a third wire to a pad stuck to the frame rail

So I disconnected it, checked the car would start and run and it does.

Turns out it was some dealer fitted dodgy supposed corrosion protection device

That according to reviews is a total waste of time.

I havenít had time to check what the has done to my current drain
Although Iím not expecting much
But who knows maybe I could get lucky
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post #10 of 10 Old 07-21-2019, 08:07 PM Thread Starter
emacca
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Update, looks like I may have nailed this

Did a parasitic drain test this morning and got into the car locked it waited a minute or to
Disconnected the battery negative and read the current draw

Started out at around 1.8 amps, I could here stuff going on etc
Kept watching and it dropped to .3 of an amp

And stayed there.

My XJ Cherokee draws .25 amps at rest as a comparison, so I’m thinking that I’m done with this problem

Time to move on
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