New setup; half of the zones not working

Konnected Alarm Panels
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A new year…, time to install my new Alarm Panel Pro. Took bunch of pictures of the ~25yr old Galaxy with lots of history you can tell. All sensors still working. But when converting to Konnected I’m running into a snag …

Firmware prepared in the app, SmartThings + Home Assistant work and show the different doors/windows.

To start simple, I’m just connecting the zones only and copying from the old Galaxy as much as possible. (leaving the siren and buzzer for later). On the Galaxy some wires had extra resistors, some connect to 2 ports (?). I don’t know what that all means, but I’ve cut the resistors where applicable.

Now, Zones 4,5,8 are working and respond to open/ close of the doors.
Zones 1,2,7 are not working and show “OFF” (closed) - but don’t respond to open / close of the door.

The easiest to verify are the zones 1 + 2, I’m identically copying zone 1 + 2 from the old Galaxy to the Konnected 1-to-1. No resistors removed, both connect the yellow wire to the GND, both are simple door sensor. I’ve re-stripped them, reconnected …

I’ve tried swapping Z1 <> G, swapping the wires connecting Z7 and Z8

Now what I also notice, the working zones are connecting with the familiar, visible on-door magnets. The non-working zones are connecting the invisible RC-33. Coincidence?

How do I best troubleshoot this? What things can I check / anything a multimeter will solve?

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I got myself a multimeter to test the circuits going to the non-working sensors. I measured ~1k Ohm. And for the Konnected Alarm panel to work I understand this should be (close to) zero Ohm, right?

I’m reading more on this alarm stuff and apparently it is/was best practice in this alarm business to have a resistor in the loop and measure the difference between 1k and OL (door open). So I think there is a resistor built into the frame of the door.

It’s going to take some messing around to get these sensors out and remove any resistors, which are glued into the frame… and its -7 C degrees outside :-/ I’ll have to postpone this project

my guess of the built-in sensor