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Hi Bob,
Confused, I was, when you said it has '79 headlights - square H4s. My '79 has round ones and the upscale models that year, I thought, had quad rectangular sealed beams in the US. Didn't the GT have 7" rounds? Guess you have an upgrade to e-codes?
But either way, the 79 wiring is the same as the wiring in my 83 flat nose with quad rectangular headlights, and it is kinda anti-intuitive because of the bulb-out sensor. It follows from the battery junction box on a red wire to 30 on the headlight switch, and from there, a yellow wire back out to the hi-lo relay. You can verify that part of it if the lights remain on when you put the high beams on. Something is wrong there if all you get is flash-to-pass, which has a separate path.
From the hi-lo relay it goes back into the cabin on a thick gray wire to the bulb-out sensor. From there, separate blue wires feed each low beam filament (on your H4s) through a connector just behind each headlight bucket.
That should help if you have a test light to go sleuthing with.
--
Art Benstein near Baltimore
"I feel sorry for people who don't drink. When they wake up in the morning, that's as good as they're going to feel all day." -Frank Sinatra
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