1984 BMW R 80 "zero turn run dead battery" Questions

zero power and is completely dead again. I waited about 5 minutes went back and it starts, runs and doesn't die... runs about 5 minutes and I turned it off... Any Ideas? This bike is so.  

...zero as the engine sputtered. i pulled over and let the bike rest for about 5mins. i put key in run position and nothing turned on. after turning the key back and forth a cpl times, it finally came ...

...turn over at all. Fuel pump is priming as usual. Headlights come on as normal. Hi, Anonymous before testing any electrical component in the Starting System it is "IMPERATIVE" that you have a fully ...

...dead battery and excessive sparking when connecting the battery. The rectifier can be checked using an ohm meter. Basically, there are six diodes inside the rectifier which should each show zero - or ...