GT fog light fix killed my car........

Sounds like something may be shorted. Disconnect foglights and try to start car. If that's doesn't work start checking the fuses. Maybe the starter relay as well.

Here's a checklist:

Check battery, terminal connections, ground, starter relay switch (also known as solenoid) and starter in that order.

A voltmeter is handy if you are familiar with how to use it to find bad connections. Measure the voltage drop across a connection: more than .5 volts across a connection indicates a problem.

1.) Will the car start if it is jumped? Then clean battery terminals and check battery.

2.) Check the battery to engine block ground, and the ground behind the engine to the firewall.

3.) Then pull the small push on connector (red wire) off the starter relay (Looks like it is stuck on a screw) and jump it to the terminal that is connected to the battery. If it starts, the relay is good and your problem is in the rest of the circuit.

4.) Remember to check the ignition switch, neutral safety switch on auto trans and the clutch safety switch on manual trans cars. If they are good, then the relay is bad.

5.) Jump the big terminals on the starter relay next to the battery with a screwdriver - watch out for the sparks! If the engine cranks, the starter and power wiring is good. The starter relay is also known as a starter solenoid.

6.) The starter may be hung, loosen up the bolts that hold it on, and give it a good whack with a big hammer. Tighten up the bolts and try again.

7.) If that doesn't work, use a jumper cable from the positive lead on the battery direct to the starter post where the big wire from the relay connects. If it cranks then, it is the power wire from the relay gone bad. This will be hard to do, since there isn't much room to do it.

8.) Pull the starter and take it to Autozone or Pep Boys and have them test it. Starter fails test, then replace it. If you got this far, the starter is probably bad.

Wow jrichker, excellent advice there!
I was just going to mention that i had the same problem after I relocated my battery to the trunk. When I would turn the key, the fuel pump would prime and everything, then when I would bump it over to crank it, it would go click and I would have no power. I checked all my new connections like at the solonoid, in the rear where my new ground was, made sure everything was clean and tight. It cranked right up and I've never had the problem since.
Good luck with it.

Yeah, bad connection at the battery most likely, and if you cables are old, they might be cracked and corroaded inside. check those cables!

i had that exact same problem when my battery cables were rotted out. check them. worked fine, then i was fillin up with gas one time and had that same problem, just happened all of a sudden

You should also check your fusible links. I had a similar problem that I traced for about two months. Even tore the entire dash out to check every wire in the harness. I finally found that one of the fusible links had been replaced and the crimp butt connector that the previous owner used had corroded, and burned up.
ALWAYS SOLDER FUSIBLE LINKS AND USE SHRINK TUBING ON THEM!