You don't mention if you have a 4, 6 or 7 pin connector.
The 6 and 7 pin connectors (usually) the wires held in the connector with a screw. Loose screw? I had problems with a plastic 6 pin connector installed from the factory and replaced it with a metal connector.
How did he determine that the connector was the point of loss?
Has this exact setup ever worked?
2001 Winnebago Adventurer, 35U, W-20 8.1
F+R Trac bars, F+R sway bars, SafTsteer, F Sumo Springs, 4 Koni FSDs
2007 Forest River Lexington Ford E450 Chassis