Voltage won't tell you anything about a battery being drained. Two things to check.
1. insert an ammeter between the negative battery post and the ground wire(s). With ignition off, you should read zero (or single milli-amps). That will tell you if you have some sort of parasitic drain. if it is 100's of milli-amps, then you have a parasitic loss.
If that is the case, then you need to start opening circuits to try and find the circuit which is causing the loss. once you open the circuit and the drain drops, you've found the bad loop. now you just have to find the issue with that loop.
2. if you read zero or single milliamps, then you probably aren't charging. you should also use an ammeter to see if you're putting current back into the battery. If you are, then you need to see that you have a voltage rise at the battery terminal when the bike is running (probably over 3K rpm).
You have to look at both voltage and current to get a good handle on the charging system.
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