You're power supply should be fine. Even if the manufacturer was a little generous with it's rating there's still plenty margin of safety. A 15 amp automotive fuse should not be causing the issues you're experiencing although you've likely at or exceeding the current ratings of the terminals.
I'd double check ALL your wiring to make sure everything is right where it needs to be and is secure. Also double check solder joints and connectors to make sure they are solid and not showing any signs of overheating. In the event that something was fried when the wires touched, I'm not what would be causing the symptoms you're exhibiting. Just for grins and giggles, what happens when you disconnect the heated bed but still try to use it like it was connected? That would rule out a high-current overload issue and possibly indicate something wrong somewhere on the ramps board.
What wires were shorted?
I'd double check ALL your wiring to make sure everything is right where it needs to be and is secure. Also double check solder joints and connectors to make sure they are solid and not showing any signs of overheating. In the event that something was fried when the wires touched, I'm not what would be causing the symptoms you're exhibiting. Just for grins and giggles, what happens when you disconnect the heated bed but still try to use it like it was connected? That would rule out a high-current overload issue and possibly indicate something wrong somewhere on the ramps board.
What wires were shorted?
