So I was in the car when it was off. I hit the break and the emergency brake light went off and the tach and fuel gauge dropped, the headlights are ultra dim and the windows won't operate? What happened? The fuses don't seem to be faulty? I was messing with the vacuum lines for the locking system right before it happened. I changed out a fuse to but it looks okay. Any ideas??? I can't drive at night like this....

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1984 300d....