Today a crusing day with my CB750K2!
This time not carb testing, nor ignition testing in legal speeds 3500-4000 rpm on 5:th gear. Charging adjustment and test. The last days cruising had almost drained battery totally after around 300 km.
Adjusted regulator, turned the adj screw in 1/4 turn which most likely fixed it. The charging supervision LED is now green from 4000rpm, allow reducing throttle to 3500rpm and still happy. It must be the relay that switch over and keep staying "high" down to 3500rpm with headlight on. LED H4 consuming 30W.
No overvoltage either with and without headlight on, LED should then flash green-red.