Hello guys,
I recorded some progress!
After checking the ground connection at the bottom of the relay box, it looked like the box’s plastic melted a little bit and covered the connection.
I removed the bolt and fixed the connection and now voila! I have only 200 mV drop between Chassis and Battery negative with engine, blower and ac on.
Can one of you send a picture with the fuse/relay box GND connection? I find it hard to believe that the connection is done on top of the plastic.
Thank you,
Rares