81 KZ550C LTD, 17K miles, been running great for 3000 miles for me. Battery finally went south this week. Replaced it with a new one. Started right up. Rode it to work and back today, then went out for a ride . . . . nothing!!!!!!!!!!! Have had a very infrequent startup problem in the past, usually remedied by a little bit of key jiggling or clutch lever fiddling, nothing major. Now, no lights, no nothing. Checked the battery: still 100% charge. Looked at the fuses under the left side plate in their litle box: all intact. Nothing looks fried from where I stand. What can I do? I am not all that adept at stuff, but willing to try (especially since none of the wrench-monkeys in my home town are willing to look at anything older than 5 years). Any guidance would be greatly appreciated.