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The problem has been found. I received a private message from a member here and now my seat heaters are working reliably.
Everyone should carefully inspect the bundle of wires directly above the parking brake pedal assembly. The top of the pedal mechanism can rub and damage/expose several wires, I had two that would find ground because the insulation was rubbed off.
Whether you have rear seat heat or not, this could be a real problem if you happen to have these wires hanging down against that pedal bracket.
Rezvani's Latest Post-Apocalytic Monster Is a Ford F-150 Raptor Underneath
Slideshow: Called the Fortress, the 850-horsepower pickup combines Raptor underpinnings with military-inspired features, survival equipment, and a starting price of $285,000.