I need 1999 Healight info

Hi all. I just recently aquired a 199 Buick Lesabre Custom. I need to know if the headlights are: Positive, Positive with DRL, or Ground. I am involved in EMS and looking to purchase a wig wag unit for my headlights and tailights. If you know of which unit would fit the lesabre thats great to. ALL help is appreciated. Thanks