General Maintenance & Repairs - Help! Car died, no electrical power

I've done some searching, and can't seem to find an answer. I finally got my 98 T/A running yesterday, after installing H/C/I/E, new Innovate big 3, 99+ converted harness, and a new PCM with a Frost tune. All seemed well, until I took it out for a drive. After about a mile, it just shut off, and is now completely without electrical power. I checked the battery connections, all the grounds, all the fuses and relays, and can't find anything wrong. I've heard this could be an ignition switch issue, but I haven't been able to check because the car is currently stuck in a parking lot. Any other suggestions? I have to drive 200 miles back to work this evening and won't be able to work on it again until next weekend, so if I could get it back up before then, it would be a huge help.

Only thing i can think of is the pcm connections

Why would that cause a lack of any power? Shouldn't there still be power to lights, radio, etc?

Bump. Any other ideas?

i don't see how it could be your ignition switch. but to check it, put some cables on and get some power. put the key in the on position and see if your security light on you dash comes on. i had to replace my tumbler system 2 years ago. to long to explain, but good luck.