I put Cibie's with city lights in my 1985 380SE (W126). I kept the stock
wiring. You will need to get some 16 guage wire and some splicers (they are
sold at auto parts stores. basically they have two slots in them for the
wires to go in, and there is a metal bar at the top. You slide it over the
wires and then squeeze it with a pair of pliers). Then you want to splice
the wires for your city light into the wires for your parking light (one is
the ground, the other is the power). Also, you will need to either solder or
crimp connectors on the ends of the wires you are connecting to attach those
wire to the base of the city light.
O.E bulbs wattage will not damage your wires or sockets. If you exceed
80/100 H4 bulbs you will need to add relays. To wire the city lights splice
into the corner parking/directional lights. Use the parking light wire
(headlight switch position 1) to pin#3 on Euro plug.
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