Linking headlights to interior light

[particlewave]

If your courtesy lights dim out, you'd need a controller circuit to power the relay. Otherwise, the relay would chatter as the voltage drops to near the relay solenoids threshold. This would cause premature failure of said relay and wreak havoc on the HID ballasts and bulbs.
You'd need a micro controller that applies/cuts power to the relay at a predetermined threshold.

Even with the controller, they'd want to come on and off a lot and would not be good for the HIDs. Incandescent fog or parking lights would be better.

[Meir]

Originally Posted by particlewave

If your courtesy lights dim out, you'd need a controller circuit to power the relay. Otherwise, the relay would chatter as the voltage drops to near the relay solenoids threshold. This would cause premature failure of said relay and wreak havoc on the HID ballasts and bulbs.
You'd need a micro controller that applies/cuts power to the relay at a predetermined threshold.

Even with the controller, they'd want to come on and off a lot and would not be good for the HIDs. Incandescent fog or parking lights would be better.

Advise taken.
On the bench the relay acted fine when I simulated the voltage drop, but I will test it on the actual wire in the car.
Agree on the fog/parking lights instead of abusing the litronics (in my case).