I used a module from a company in Canada to accomplish daytime running lights. It pulls power from the battery and uses a wire that senses ignition wire (spark plug) power for a trigger. Hence, engine has spark, module lets power flow to the headlights. It also has a voltage reducer built in becasue it supplies only about 50% of the voltage and the headlamps are not as bright when working in day time run mode. the power flow is stopped when it senses normal power supplied to the headlamps from the switch and the headlamps go on to normal brightness. Very slick. Inexpensive too, about $30 and 30 minutes to install. I also wired the power suppy to the module thru an extra hazard light witch that i had from an older MB ( no text or lettering on it) and I snappe dit in to the old location of the radio speaker fader switch in the gear shift console as a positive on off switch so if i dont want the daytime light to come on, I can turn them off. Because at night even if the lamp switch is on the off position, the day time light will come on, they are not light level controlled, they are engine on or off controlled. it all worked out very slick and it looks factory. I made a transparent background, white lettering overlay for the switch to label it as "DRL off" in the off postion and it all looks very OEM. I like it. AND, I got rid of the crazy factory speaker fader switch that I didnt need any longer!

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Christopher Henkel
1990 190E 2.6 - Arctic white SOLD
1986 190E-16v - Blauswartze
1993 300CE - SOLD
2003 W208 CLK 320 Cabriolet - Magma Red