Please help me ID some of the wires under the dome light on my 2004 SL600. Reason is I wanted to wire in a dashcam which will only have power when the ignition is on. I have checked the voltage on every pin of every connector and only find constant +12V on one red wire. No others have power when the ignition is on. I will therefore have to feed something up there to power the dashcam. However, as explained/shown below, I have two wires which are not connected to anything.

In picture 1, I am pointing to a 2-pin connector which continues to two loose wires, not connected to anything. Both wires then go up and left into a sleeve and then down the A-pillar. In picture 3, it appears that sleeve was added later as it is held to a bigger harness with electrical tape. I could not determine where it goes under the dash, it seems to go into the front left fuse box area. Does this look aftermarket? Maybe it was added to power a radar detector? (But now won't take even a small load.)





In picture 2, I am pointing to what appears to be a shielded cable. Any idea? Is this a front windshield antenna for the radio? It also goes up and left and then down the left A-pillar. BTW, its not the microphone because that is separate and still has the part number label.




Picture 3 shows what I call the harness, the sleeve which has the two wires which are not connected anywhere and the shielded cable which I wonder is an antenna feed.



Last, there is a yellow connector which seems to go to the "SOS" switch. Since all the telephone stuff has been disconnected, I assume safe to disconnect that. I thought I saw it blink a few times, making me wonder if it is using power.

Thank you for reading and hope someone recognizes these wires.

(More on those non-connected wires. One wire is ground. With ignition on, the other showed 5V, but as soon as I put even a 100mA load on it, the voltage fell to nearly zero.)