this is the guts of a regal drl module. it controls the blinkers as well as the drl, mine was acting like the front drl, same bulb as my turn signal bulb, was burned out, (so no frl on one side) but would hyper flash when using the turn signal.
no sure on the GP, but if its the same kind of set up that could be your problem.
these two large pieces with all the copper look to electro magnets of some sort, when the blinker is turned on, the metal plate inside the left side edge, see the spring holding it back, it moves the plate to the copper wire's tab, and makes a connection. then blinks.
