extreme wiring issues

Hi everyone, first post here. Just traded my old beat up Starion for a nice looking '92 Lebaron conv, 3.0 5spd. Everything was going good until I was sitting in the drive thru, all of the sudden, my tach stopped working, gas mileage computer shut off, radio just had gibberish on the screen, the doors would unlock, but would not lock. After getting home, I took a look at fuses, and the 10amp for interior lights was blown, i replaced it, and everything worked again, a week later, same story, only this time when I replaced the fuse, nothing happened. I recently found out when I turn the parking lights (and interior lights) on, my doors will lock again, but everything else still does not work. I have looked at the wiring, and nothing looks altered. I see a blue 6 pin connector sitting under my dash, thought that might be the culprit, went to the local wrecking yard, and every car just had the connector sitting there like mine. I am stumped... any ideas anyone?

Thanks for your time
Tony

tony thats your data link connector.as far as the dash lights, i would check your battery grounds.