I saw that red wire jumper and wondered what it was for. But since you are so busy anyway I didn't bother to ask.
Every used car/truck I buy has mystery wires and or extra wires.
I grew up in a wrecking yard and we would see all kinds of interesting things done to the vehicles there. People will wire around the wire loom with miles of wire instead of tracing the problem.
Your jumper is odd to me because if the blades that are jumpered are both hot or are both ground the jumper makes no sence. It also seems odd that those blades would be exposed if they are hot.
Any way once again I have commented to let you know I am here every day keeping up with your "Grizzifactions".