this does not happen always just every now and then ... when driving my headlights will blink on and off and some times go out completely . has anyone had this problem and what do you suggest ?. ive replaced the on dash headlight switch but didnt change anything . like i said it doesnt happen everyday just once in awhile

 

I have an 89 GT and when I put my driving lights on, my headlights do the same after approx a minute or a little less. Not to sure whats causing it. I replaced the switch too. Im starting to think it has something to do a an abnormal draw on power but my meter on the dash looks ok. Cant figure it out either.

 

try checkin the grounds

 

i added grounds. one more thing . it happens even worse when i run fog lights or high beems . i unplugged fog lamps and rewired through relay and toggle switch so its not the fogs .

 

check the grounds to the headlight,relay and the relay itself.

Start pounding on your steering column, dash and wiggle the harnesses, you'll get an answer