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I'm not familiar with the K100s but I've been turning wrenches since I was twelve and that was a bunch of years ago. Most likely your issue is not with the negative side of the battery. Unless the bike is a positive ground system like the old British cars, hitting the frame with the negative side would have no effect on the system. I suspect you grounded the positive side or possibly hit the positive terminal of the alternator with the negative side. There should be a main fuse, possibly separate from the fuse block so start tracing wires from the positive side of the battery. The other thing to look for is a fusible link which looks much like a regular wire but will have an amperage rating printed on it. Many times they will take on an oily appearance when they blow. So make sure the ground is tight at the battery and frame, clean the battery terminals (even if they look good on the outside) and start tracing voltage from the hot side of the battery. You should find it pretty quickly.
 
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