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Discussion Starter #1
Hello to all ! I'm just trying to find out the source of a parasitic drain on my son's 2000 323Ci, I just replaced the battery 2 weeks ago, the alternator is charging the battery, but I still have a parasitic drain on the car, I think the navigation unit is the culprit and just disconnected the unit and removed the radio/navigation fuse, when I disconnected the navigation unit I just tried to reinstall the fuse for the radio/navigation to reactivate the radio and I'm getting spark from the fuse panel every time I try to reconnect the fuse into it's place, is this normal? :yikes:
 

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I'm not sure if you should expect to see the spark or not but it doesn't really surprise me. I'll let others comment on that.

As far as parasitic drains, 9 times out of 10 it is caused by the "hedgehog" final stage resistor (FSR).

In order to test for a drain like this, I bought a fuse buddy mini tester that plugs inline at the fuse and shows how much current is flowing through the fuse. Note that you have to wait for the car to enter sleep mode or whatever it's called.

https://rover.ebay.com/rover/0/0/0?mpre=https://www.ebay.com/ulk/itm/332452318655

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A small spark when plugging a fuse into a location where a device has a constant draw is not unusual.

If you have concerns, you need a decent multimeter that can measure 10 Amps and then measure the overall for the fuse position you are concerned about and then for the overall car.

Best to have a meter that also has a Max/Min hold function so you can capture the Max current draw while the car is unattended.

A device like this make is easy to test for current draw on an individual circuit.

https://www.amazon.com/ESI-303B-Fuse-Buddy-Adapter/dp/B000TQ15E0/ref=pd_bxgy_263_2?_encoding=UTF8&pd_rd_i=B000TQ15E0&pd_rd_r=BTQRTRFB0FP3RXQ2N4SR&pd_rd_w=qpSoJ&pd_rd_wg=kOYu2&psc=1&refRID=BTQRTRFB0FP3RXQ2N4SR
 

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Discussion Starter #5
Well I ordered the fuse buddy and I’m still waiting for it to arrive, but in the meantime I just took a look at the trunk and the navigation unit is making weird noises and flashing the ON led all the time so went and removed the unit, recharged the battery and have been checking the voltage at the battery for 2 days and I think I have finally found the culprit ! Thanks again for all your support guys !


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