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Power Antenna 'Sense' Line Current Drain

I'm not convinced that the BMW antenna has a sense line.  I've taken apart
mine and all of the control is inside the box.  The radio just says, "go up"
or "go down" by applying power (or not) to the antenna.  I'm sure you can
reverse-engineer the circuit, but it will be breaking through the sealed case.

   Erich Whitney      ________
1989 E24 635CSiA    o/________\o
    Alpine White    (oo==OO==oo)
                    [ o= == =o ]