Hello all, I'm having a crazy weird issue with my 91 GT. When I'm using my headlights in high beam all is fine. When they are used in low beam all is fine. However, if in low beam position and foglights are being used, within minutes the lights all go out. Crazy and weird. So I have to stop dead in the road and turn all lights off then turn them back on a few times without the foglights in order for them to vome back on at all. All lights are new as well as the 'pigtail' harnesses. All bulbs are new as well. I also have a new headlight/foglight switch and multi-function switch. Any suggestions??

 

My guess would be the headlight relay... I remember this being an issue back when the cars were new, but I cannot recall the remedy. I do know that Ford issued a TSB to fix the problem.