|
The factory "ILL" wire is as you said, a signal wire. Dimming is done with the negative wire, either by the knob or ECU depending on the light you're talking about. The radio dims internally.
It may be possible to use the ground that goes through the dimming knob, but there is an inherent risk to the entire system if you do that. Also, seeing as you're using aftermarket LEDs, you'll want to test it as well to make sure it works properly. Many LEDs need a PWM to dim properly.
If it were me, I'd pull out the dimmer switch, test out the wires, tap into the necessary ground and run an LED off it (with a diode in place to prevent any unwanted frying of stuff). See where that gets you first.
|