Didn't GM have a recall on those headlight switches? Mine did that a couple years ago. Toasted the switch and the wiring connector it got so damn hot.

No tailights is a symptom of a bad switch.

yeah mine did to 3 years ago. I replaced the 95 switch with a 99 one. Had to splice in a newer harness to.
Hasn't given me any problems since.

i checked all my fuses they are good

Has Jesse called you yet?

my ground bus is ok, whats next. maybe the switch

yea he said try the ground bus

Do you think you could pull the headlight switch out of the dash to take a look at the switch and connector going to it?

I took my car to the shop, as soon as they took the headlight switch connector out it fell apart. wires were fried and the harness. Thr shop found the the switch but not harness anywhere!!!! I looked all over the city and found nothing. then the last place i called had a harness but it was for a diffrent kind of bonneville one with a daylight runner. I don't have that in my car. the harness looks like mine size, shape but 12 wires my car has only 9 wires. car still in the shop. hoping it will work. they also said i was lucky my car didn't start on fire.

it was the head light switch connector

Hope you changed the switch also. It'* the switch that gets hot and melts the connector.