Slight rookie problem!
 

Hello there, fresh Volvo owner here in Norway. I've bought my grandfather's 1994 Volvo 940 GL, and I'm loving it.

However, I bought a new, unoriginal radio, modern radio with bluetooth, AUX, CD player etc. Thing is, when I removed the old radio, the car was unable to activate the high-beams and the low-beams. I'm also unable to figure out which wires go where. Apparently, my grandfather had the ability to connect a phone to the radio and speakers installed, so the thick wires are apparently those wires (I Think). That leaves the rest of the thin wires, but which are which?

Attachment 26768

Attachment 26769

Any help would be appreciated :)