European Parking Light Conversion by Toby Erkson

This modification allows you to turn on the parking lights on the side of the car that is exposed to the street. It's particularly useful on dark streets and allows motorists to better see -- and avoid -- your car. Yes, you could simply leave your parking lights on but then your car wouldn't be as cool 

You park your car and remove the keys from the ignition switch. Put the turn signal stalk on the side of the street the car is exposed and that side will stay lit. So if you park on the right side of the street you would push down on the turn signal stalk -- like you were going to make a left turn -- and this will light up the left side since that's the side exposed to the street. Same thing goes for the right side but you push the turn signal stalk up, like you were making a right turn.

As a test, I've left my EPLs on all night and they didn't excessively drain the battery i.e. she starts right up in the morning. But I also use an Optima battery...

This does not disturb my after-market and stock alarms. They continue to operate normally.