That is in human terms the Cerebral Spinal fluid leaking out. Not good. In years past most people would carry a spare ECU unit and a ballast resister in their glove box.
I believe it allows the U shaped speed nut to slide on That allows the 5/16 bolt to tighten the tray down. It also requires a brace below the tray. Do you have that?
No one yet has been able to beat my 16 year old red top Optima. If I hadn’t owned it I wouldn’t believe it my self. But the one thing I have always done was DC the positive cable when I park the Dart.
Those were a real old attempt at a car alarm. They had to be mounted level and it was wired into your car horn. It worked off a pendulum principle. When your car was rocked it made your horn beep when the contacts closed. I had one or two.