The switched 12V is fed from fuse #5, 10A; the unswitched 12V is fed from fuse #8, also 10A. Both fuses are located in the glove box fuse holder. Don't be confused that there are only six fuses in that fuse block; the first four fuses are in the engine compartment.
The wires feeding 12V to the connector, including the ground wire, are 1.0 sq. mm, which is approx. AWG 17. Splitting the difference between AWG 16 and 18, 1.0 sq. mm wire should be good to about 15A at 60°C (the most conservative rating). De-rating for bundled wire would take it down to about 10A. That's exactly the current at which these circuits are fused. The takeaway here is that it would be entirely safe to draw up to 10A from either circuit (a bit less, actually, to account for the instrument cluster). The most damage a higher load would do would be to blow a fuse.
It bears mentioning that this is not a suitable source for higher-current loads such as a Stebel Nautilus horn, or for jump-starting.
Here's a sketch of the alarm connector with pin assignments. View is face-on: