The front driver's side fender light & grille light works as running (parking) lights but they do not flash in turn signal mode. The other lights work fine in running light, turn signal, & 4-way flasher mode, but the front driver side lights don't flash. I tried swapping out the flasher units for G.P., but no change. Doesn't look like any of the fuses are blown. Looking at having to trace the wires hand over hand, unless somebody can suggest where to look first.