1981 Suzuki GS 750 L "happened turned lights heard pop" Questions

...Turned off key then back on now nothing. No dash light, no head light, nothing. The click you heard was probably the sound of the main fuse popping. To locate it, just follow the positive cable from ...

...heard a pop near the headlight and all the lights went out but the bike kept running until I shut it off and saw smoke coming from the igniter unit which has obviously been fried. Now when I turn on ...