Trying to wire in the hardtop plug, now the interior lights don't work, radio will not turn on and the gas gauge isn't reading. What should I look for?

This is what my diagram says.
Green= Ground
Brown= Full time power
Brown/Black= Ignition/accessory Power
Blue/Orange= Amp
Pink= Interior lights
Brown/Black= Interior lights
Black/Org= Amp
The radio shouldn't be getting that hot, try this. Connect only the Green, Brown and Brown/Black wires then turn the switch on and if the radio heats up there's a problem with the radio if not continue to connect wires one at a time and watch for a heavy spark I think the amp is heating up due to a cross circuit connection going to the speakers or the external amp.
I hope this helps. Take care. If I can be of any more help use comment and it will show up in my email.

on the web a complete wiring diagram with images.
images for 1995 dodge avenger wiring

the radio and digital gauge sound like worn out.interior light coming on by itself could be faulty door ajar switch.

Have you lost the chip out of the key?? try the spare key before you go any further

I hve the same problem go under the hood for the fuse box you will c a fuse that has a blk clip around the whole fuse it self to open it use a small screw driver the ones u use for ur glasses nd open it c if it needs to be changed out if good jst unplug it nd c wat it does on my car I jst unpluged it nd now everything working I think its called a iud some wired name but u can't miss it good luck

I can help you out with the left turn signal not blinking. Maybe it's a flasher or the light bulbs aren't getting current through the wiring.

I can't help you out with the interior gauge lights not turning on when you turn the headlamps on. It may have to do with the headlamp switch, though.

I've never seen the lights on the radio not dim when the headlamp switch is turned on. hm.

Good luck on this repair.

Engine size and trans would be hepful information.......fuses in the cab? this is a Camry right? Check the 3 main fuses in the fuse box under the hood, then check ALL fuses.

this is a body control module (BCM) fault, replace it..

Check fuse 17(15amp) in the interior fuse panel.

you should check all of the fuses. every one even the ones you dont think are related.good luck.