Disconnect the negative cable from the battery.
Measure the current between the negative battery terminal and the negative battery cable.
If the leakage current is not correct, measure the leakage current by removing the fuses from the main fuse box and the fuse box one by one.
Attention! Switching on electrical consumers when measuring leakage current can damage the meter.
Standard current: 20mA (maximum).
Check and repair fuse harnesses and connectors that have reduced the measured current when removed.