So I just rewired my 500cc RH500. New harness, reconditioned dynamo, new mechanical regulator (sure its a Wassel). Soldered joints throughout.
Not running with battery connected everything works perfectly with ammeter showing a discharge with lights on. When the bike is running I have a steady 4 amp charge at the ammeter with lights on. When engine is stopped and lights off I see a very slight discharge on the ammeter, to clarify that is a very small fraction of the discharge shown with the lights on and not running.
When I connect the battery I can hear the regulator activate. I believe this is the reason for the discharge.
Before I do anything else with the regulator ( adjustments etc) has anyone any experience of what may be happening here.
I should mention I have now introduced a on / off switch at the battery to prevent the battery totally discharging with the battery connected.
Many thanks Rob
54 Square Four, 1934 RH500 twin port, 1936 RH500 single port, 1945 RH500 (1936 ) twin port, 1947 VB Buttermilk.