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There is an orange/white wire on the D3 harness that needs to connect to the vehicle's illumination wire. This wire should be orange as well on your aftermarket harness.I have a D-3 and I installed it, one question for you:
How did you get the system to dim automatically? I'm sure I missed this step during the install.
Strips of ABS plastic I trimmed to fit.What did you use to close out the open space on each side of the unit.