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Old 30-04-18, 07:09 PM   #1
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Default Eelctric fault draining Battery?


i have a 308 GT and also a Mini One D.

My Mini One D keeps going flat if not used more than 24hrs, but the Peugeot is fine.

I have checked the battery drain on both cars, and the mini seems to be taking 1A when nothing is running ( only interior light is on due to boot being open). So I thought this is a bit too much and perhaps something is draining battery

So I checked the peugeot and according to my dmm that one is taking 2.2A when nothing is running! not that seems to me way too much, but the thing is that the peugeot has never been flat. We even went away for 3 weeks and car parked at the airport, thought when we come back battery would be flat, but the first turn of the key and all was ok and started.

So am thinking maybe my meter needs calibration?

Has anyone checked the drain on their car to see what the usual drain should be ?

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Old 01-05-18, 11:33 AM   #2
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Can't speak for the Mini, but Peugeot's have an Economy Mode which shuts off power to certain accessories (heater, radio, interior lights) in order to stop the battery being drained flat.

You'll probably have to fuse pull in order to find the culprit.
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Old 01-05-18, 06:29 PM   #3
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If you're checking the drain with the interior lights on, then don't forget a 5w bulb is half an amp. Of course it should go out when you close the door.
Add to that the BSI will wake up as soon as you unlock the car, and that takes power.

The only way to check drain is to leave the car for some time before checking. Then put the ammeter on both the positive battery terminal and the positive connector, then remove the connector from the battery.
I dare say the mini would be similar, but clearly there you do have a problem. Just make sure there is no interior light left on which you can't normally see.
2015 308 SW II Allure 1.6 Blue HDi 120.
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Old 21-10-18, 11:05 AM   #4
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Quick update on this:

The Mini draws about 1amp when first turned off. After about 5-10minutes, the various ECUs start to turn off and eventually it drops down to 40mA when car is hibernated.

After 10 minutes, my mini was still drawing 500mA and pulling various fuses, once i pulled the radio it dropped down to about 10mA.

It does have an after market Parrott installed on the radio, so it seems that is not going to sleep properly and draining the battery. Have pulled fuse out for now and no radio until I get it removed.
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