draining battery

[dave36]

just got derbi gpr 50, put in new plug, new battery, driving great untill it stopped dead, tried to start it no power in battery, had to get jump start , drove half mile dead again, took out battery put another new one in , started great went to work came out bloody dead again , replaced regulator with secound hand one , still no use battery still been drained, any ideas

[Blue_SV650S]

You need to get a multimeter on its a55!

Sounds like the generator might be suspect.

Get a multimeter, and test the voltage across the battery with the bike off, then with it running on idle, then again with it runnin on ~30% revs.
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