I was checking my ground wires in the engine recently and realized the brown wire that connects to oil filter housing loses full ground connection once I start the engine.
I am checking with a voltmeter, and until the car starts there is full connection. Once the car starts there is not full grounding anymore but 50 ohms of resistance.
Is this normal? I have already cleaned that connection but its still happening which worries me that this may cause other electrical issues..

Any help would be greatly appreciated..

Ozzie..
X5 4.4 2001