Defective voltage regulator.
The voltage regulator/rectifier is mounted on the battery case.
63 HP
http://en.allexperts.com/q/Motorcycle-Repair-837/1985-Honda-Shadow-Clutch.htm
As far as I know this regulator can be used on several other 4 cylinder Honda motorcycles of similar engine size, from the late 70's models to the 90's models.
Sitting on it the right side
The fire. order is 1-2
Below the side cover on left side .Has cooling fins. ...
two 36 mm carbs
The main fuse is located above the voltage regulator rectifier. The cooling fan has a inline fuse. The remaining four are located between the speedometer and the tachometer under the dash panel.
SAE 10w-30 oil
The main fuse (fusible link) is located above the voltage regulator/rectifier which is underneath the right hand side cover where the battery is. Hope this helps.