Stranger12

Hi All,
My e60 is draining battery overnight.

I have changed the battery from 90ah to 110 bosch and still doing it ( i did re program the ecu)

I started with pulling fuses out and checking amp draw on my battery .

something like below
UNI-T UT216A True RMS Digital Clamp Meter AC Amp AC DC Volt Ohm Capacitance Test | eBay

now It was a nightmare to find the cause as when the car was off it was pulling 5-6 amp which is a lot and then gradually it will go down to around 2-3.

I realised when I pulled a fuse out and back in, some of them cause amp spike which I guess was because the system realised power is back and was re adjusting or something so delay there.

it turned out to be the fuse in glove compartment which is for idrive/radio.

I have seen some people saying bluetooth module can drain battery .

I have taken the fuse out and waiting to see the result tomorrow.

the fuse i took out was 5 amp and has disconnected idrive ,radio ...

so my question is if that was the cause, how can I narrow down what it is within that cabling as there is dozen items on there .

secondly, i saw a current of 40 amp when car was on, on the positive terminal. it was around 9 on negative. is that suggestion 31amp is going to power equipment and 9 amp to charge battery which is coming back?
it reduced to 1amp after a while which i think it is because of IBS asking to tell alternator to stop charging.

what do you think?