Aaahh meee. So I go back to my problem and find things have changed. Now I hear the headlight relay working. I also find that there is no longer 12V on the yellow. I put everything back in place .. held my breath and hit the headlight switch .. and I hear a slight clunk but nothing moves. Maybe the motor is toast due to overheating or maybe the limit switch is stuck closed and the motor is still trying to close the buckets but is up to the stops.
My plan is to check the voltage to the yellow wire when the key and switch are on. If it is back to 12V then the limit switch has malfunctioned. This doesn't mean that the motor is DOA but I'll see, I tested the up limit switch and it works. I also can pull the wires on the down limit switch and see if it is off or on (it should be off .. I'll see).
Why the 12V on the yellow wire with only the battery connected has vanished is beyond me .. one of the great mysteries of Pantera electrical systems. The beat goes on.