The manual link everyone used is now gone,havent found any replacements yet. Your bike is having quite a few of the symptoms that the regulator/rectifier&stator all need replacing. The year bike you have is notorious for that,especially when bought used.
If you plan on keeping the bike,you could always spend some money and *buy*a factory service manual from Suzuki.
If you plan on keeping the bike,you could always spend some money and *buy*a factory service manual from Suzuki.