Would there be any way to obtain a wiring diagram for my '91 SSE? I'm pretty confident there'* a messed up ground wire somewhere, but I've no clue where to start.

You need someone with a 91 to probably help you out. Can you give me a more specific area of ground problem you are having. Maybe Randy'* 90 manual (downstairs) has the info you need.

Well, to summarize just about everything, my power antenna doesn't work at all (it worked fine when i got the car), my power windows have been getting slower and slower lately, and my interior lights have been off since my uncle and I were taking a look at replacing the power antenna. We couldn't figure out why it wasn't working properly so we took a look at all the fuses, but nothing was out of the ordinary. Any advice?

It doesn't sound like you have one problem as in a faulty ground, more so multiple problems. The window motors in your generation Bonne can become painfully slow over time. There have been other topics where members have cleaned and regreased the tracks inside the door to improve performance. I would recommend doing a search for more details unless someone who has already done this procedure can summarize their findings here.

Have you checked both the driver'* and passenger'* side fuse boxes for blown fuses? Do you own or can you borrow a multimeter to test the wires at the antenna? I think my 90 manual would help somewhat but there are enough differences between the two cars that specifics might confuse things more.

Click here to find a thread of members that have Factory Service Manuals. Look for one that has a 91 manual and send a PM. Meanwhile, I can give you some general information from my 90 manual when I get to Bill'* house Sun morning.