Ive been searching quite a bit and havent been able to locate any info on the testing procedure for the fogs. Ive looked thru the online manual links i have as well. Both bulbs good. All other lights work. Fogs will not. I was going to check for voltage at bulb but didnt get to it today but if there isnt any, which im sure theres not, then i couldnt follow the wiring far enough. Help is appreciated. Also im confused on euro and us headlights. I thought the euro were h4 bulbs. Ive got clear corners and 9004 headlight bulbs with the clear fog lens. Headlights say bosch and dot. Which lights do i have? Thanks in advance.