Oh ok, understood. BUT! The problem is that there was no "new" wire. The person who did this cut open an existing harness, pulled out a green wire probably 18-22 gauge and used a 6inc black wire to extend it and put into the bulb socket. And I have no idea what this green wire is for....and tracking it wont be an easy task. And I dont see any type of extra wire that could have been used for a radio...etc

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190e 2.6 1990. 300,000 KM
C230 K 2000, 130,000 KM