Try using a multimeter to measure currency with the fog light switch turned to on. Then just start from one end and work your way to the other. Try and find out where you are losing power at to the lights. Try before and after the relay you replaced, at the switch, at the foglights themselves, etc.
MistressZ-"I'm so damned discouraged with my TT and must sell it. ...a beat up 91TT. How much should I be asking for this thing?"