My '87 GL has been having electrical problems. The most obvious problem is that the cd deck will randomly not work at all. I noticed that a power cable from the deck is connected directly to the posotive battery cable. My left headlight got a rock chip, thus allowing moisture into it and shorting it out. Could this be causing problems with my whole electrical system? I was thinking about going to pick-a-part and getting a new(old) headlight fixture. The car has spent some years in a driveway so I think that I may need to just replace some of the wiring due to moisutre and whatnot.

Headlight shouldnt affect the CD deck. But I would be putting a inline fuse to the deck. Might want to check all the wiring on that to see if its wired correctly. Power should be to the ignition and the yellow (most times) is constant power.

If it sat, the first thing to check are your ground connections from the battery to the body and the engine block. if they get loose/corroded/looked at wrong they'll cause all kinds of strange electrical problems. Plus, it's very easy to just pull them off, sand, put them back on.

Yeah, check grounds. Then check the ground on the CD deck. Maybe run it's own little ground wire from the deck body to the car body.