The rear window defogger relay on my 1986 911 Targa does not engage the upper and lower elements.?

There is a time delay? Time constant circuit? which should, at some point, engage relay #2 and put 12VDC onto the upper and lower elements.





The maximum voltage seen at the input of the top/bottom


elements is .25 volts.





The center element works fime as relay #1 is not wired through the solid state timing/time delay circuit.





Does anyone know how the upper and lower element


sequencing occurs?





Notes:





1. The defogger relay p/n 911-615-115-00 is new.


2. There is a 1.5 Ohm resistance from the input wire


to the upper and lower elements which are connected in


parallel.


3. There is a 1.9 Ohm resistance from the input wire to the


center element.