How can I make my fender lights flash with my turn signals like an 18 wheeler? Surely the 2 sets on each side use a different wire for each frame rail, or do they go across the cross-rail with the fuel lines? I know I'd have to have the relay set with turn signal on the trigger side and the wire to the markers on the output side, but what number ports are they and what size relay would I need? To make it work during the day, wouldn't I have to make the wire from the cab become a constant feed instead of a switched lead? Anything I should know about, legality wise or electrical wise?
And I haven't looked, are the markers on the front lighted or reflection only?