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2025 c3 ('74-'82) of the Year Finalist - Unmodified
2019 C3 of Year Finalist (appearance mods)
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On the dimmer switch there are 4 wires, green-green-tan and blue.
One green goes to the high beam bulbs.
The other green goes to the high beam indicator in the dash.
The tan wire feeds the low beam bulbs.
The blue feeds the rheostat in the headlight switch.
Your 2 wire green/yellow may be green and faded green.