Signal, DRL, headlight possible ground issue???

I have a 97 Sunfire GT and have been having some problems lately. First it started by all lights works then in a 1 week span my low beams and DRL didnt work but Highs and signals work. Then all worked for a day except DRL's and now the signals dont work but the others do. I have to get a mechanical and the autoshop says that there might be a ground issue under the battery box or could be the actual light/signal switch. They never looked at it yet but say they heard of issues like this with the Sunfires before.
I just want any of your insite about people facing an issue like this and if you found the problem and fixed it. Thanx

9 times out of ten.... Its the whole wiring harness which goes bad. Here is the connector and grounds under the battery tray...

http://img171.imageshack.us/img171/4450/20071211image0002da4.jpg

It might be a switch, but not likely. Check that ground first tho.