HELP! Stranded!

Hey Guys - accessing through my very basic phone, because the car has me stranded. 72 Dart Slant 6 Auto w/58k miles. No hints of any electrical issues, stopped at a friends, came back 20 mins later, hit the key & nothing. Not even the door buzzer works. Odd thing is that it has very very low power throuought the car. Examples would be I can hear the door buzzer/door light switch click, but no buzz with key in. I can turn on the dome light, but it comes on slowly. No headlights/flashers/signals, but I can here the hazard flasher going. No dash lights at all. Radio will work in ACC position, but comes omn slowly, and if I try to turn on anything else, it goes out. Checked the ballast resistor visually. Tried jumping the starter relay with nothing. No obvious bad wires. I don't have a test light with me. Could this be the fusible link that comes out of the bulkhead connector in the engine bay, & can I bypass this temporarily? Any help is appreciated!!