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2021 HR Extended AWD Transit T-250
358 Posts
Could you elaborate on this? What "analog bus" are you referring to?
I don't have enough info to be actionable, but here is what little I think I know.

The bottom coil of the harness in this picture is the analog bus that can be used with the earlier generation controllers. In the current generation heaters, that branch is unused, just protect the ends from shorting and tuck it away.
Wood Art Font Circle Jewellery

In the diagram below, c2 is the analog bus pictured above. Mike mentioned that the red & yellow wires on the analog bus is what folks were using to accomplish the remote control of the heater.

My caveat is that tons of info was going back & forth during the multi-hour troubleshooting session with lots of off-topic tangents like this one. Please don't take this as gospel.

Rectangle Slope Font Parallel Schematic
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