Rapidly fluctuating voltage on Banks 2 and 3

2004 Gen 2 with 250,000 miles. Red triangle, P3030, no start, will not shift into drive. Torque pro voltmeter for Banks 2 and 3 of the hybrid battery jump from 0 to 15 and back to zero rapidly. I have removed the battery pack and all cells are approximately 7.7 volts. Is the problem with the wiring harness or the brain module?

 

I have cleaned all bus bars and treated with anti-corrosive grease. I'm not sure whether that was a good idea or not. I toned out each individual voltage sensing wire for the different modules I did not take an OHM measurement. Each wire had continuity.

 

Haven't had a chance to get back into it yet. That's on the schedule for this afternoon.

honestly I have only rechecked the side of the batteries that has the sensor wires on it I have not checked back side at all it's possible I missed tightening one of the screws on the back side.