Is this on your 69 bird, or your 79 TA?
If it's the 69, it could be the parking lamp circuit. It's my understanding that the parking lamps are divorced from the high amperage headlight circuit via the headlight switch. If the parking circuit failed on the headlight switch, it would take out both the parking lamps and the dash lights, but the headlights should still function.
That's the first place I would check. Unfortunately, where that's positioned, that almost means a full dash bezel out experience on the '69, which is never fun.
If this is on your TA, I don't have information about that, but the situation may be similar.
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-Jason
1969 Pontiac Firebird
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