1 Wattage of DLR,s
2 Type of bulb (LED, HID, normal filament bulb, etc)
Low wattage normal filament bulbs could be done with a resistor
High wattage fillament bulbs could be done with a voltage regulator
HID might not be possible without modifying the existing balast controler
LED's will depend on how they are powered already.
I'm ok with DLRs, I just don't like them flashing or diming with the indicators as I feel they distract you away from the indicator, it would be different if every vehicle was the same but there are so many ways it is being done.
Home to black Alfa Romeo 159 3.2 V6 Q4 ,green MGF VVC andred MG Maestro T16.
I seem to recall that it's a legal requirement that DRL's dim on the side that the indicator is operating, presumably so that they don't outshine the indicator.
The fact that some dim and some don't suggests that there are a lot of illegal installations out there.
Perhaps someone knows the truth on this subject.....
I know they need to dim with headlights/Sidelights, but I've not heard that they have to dim with indicator. Suppose it also depends on how close to the indicator they are.
Next you will be wiring your fogs to come on when you turn the steering wheel.