I checked the voltage between the terminals off the battery before i turn the ignition on and it shows 12.x but when I turn the ignition on, it will quickly drop. 11.x to 10.x then i turned the ignition off since i don't want to get my battery drained.

I did a leakage test and it show 0.05 mA.

Could it be the battery? or a bad wiring?

 

Seems normal to me, when you turn the ignition on there is a draw on the battery. If the bike were running (higher than 3k RPM) I would expect the voltage to be 12-14v...are you having problems keeping your battery chargerd?

 

Yes sir. Voltage won't go up more than 13.5 even if I rev it up to 2.5K RPM.

 

well, you don't want the voltage to be higher than 12-14 with it running. That would be indicative of a bad regulator rectifier. If your voltage is 13.5 with it running that is a good thing. But, if you battery is not holding a charge get it tested. Bike batteries don't last long.