Hi Steve,
Nope, no loose wires to be seen.
Did some new measuring with another Multimeter
Brown between Red 158 ohm

Trigger measurement:
Green between Red/white 117,3 ohm
Green between Green/white 116,5 ohm

Green/white between Red/white 232 ohm
Measuring between the two pickups= 9,87 kohm
Measuring between upper pick up and ground= 5,64 kohm
Measuring between lower pick up and ground= 3,92 kohm

What I don’t understand is why there is no reading between wire and pick up itself, in my simple world it should be. And why is there connectivity to ground from the pickups ?
You don’t need to give the full explanation, just tell me if this is OK.

I do have a different color scheme but what I have discovered is following.
Green = my black/yellow
Red/white = my blue/yellow
Green/white= my Green/white

I have discovered following (I stick to your color scheme) Red/white is somehow in connection to lower pick up and Green/white to upper pick up.
I discovered that with following test:
Measure between Red/white and Green and move a hammer over lower pick up the ohm fluctuate between 117 and 125 ohm.

Measure Green/white and green, move the hammer over the upper pickup and the reading will fluctuate between 116 and 122 ohm.

Does this give you any idea ? To me it indicates that there are some life in the coils and magnets. But maybe the readings should be different.

Tried to search for another pickup on the net but it seems not to be that very common. Any ideas where any spare one could be found.