64 Dart headlights, gauges, interior lights went out

I have a 64 Dodge Dart gt with slant6. I bought it after it had been sitting for about a year, started right up mostly original except for an installed stereo. I drove it around for a couple months and one day it rained and my fuel gauge stopped working. Then my Temp gauge, then my interior lights, head lights, and all my back lights.

I was also having trouble starting it until I found the ignition wiring had been burnt- so I stripped and replaced the connectors and it starts, sometimes. I'm trying to restore it although I'm not big on wiring, don't know much but I have my manuals though I haven't been able to find the problem yet. All I know is that my alternator is working fine and so is my battery. I replaced spark plugs and tubes as well but haven't touched anything else.

Any help would make my day thanks.