I think you may have 2 unrelated problems, so treat them independently for now.

What is happening with the seatbelt light when you buckle and unbuckle the seatbelt? Does this problem go away when you unplug the electrical connector to the seat belt buckle switch?

 

Hi PA, thanks for your response. I ended up passing this car on to another owner who wanted to work on it. Thanks for all your help in keep this one on the road.