battery draining

So I have a 1968 raider 12 wheel horse tractor has a brand new battery has been running great now all of a sudden my battery seems dead Everytime I got to start it I have to put it on the charger then it will start and run great what could be causing my battery to drain?
 
Conductive corrosion and debris in the ignition switch is a common cause of battery draining as is a failed rectifier/voltage regulator.

NOT sure if this is the exact wiring for you machine, but FWIW...

<img src = "https://i.imgur.com/tLUDm0I.jpg">

As to testing the rectifier/regulator, you can download the official engine manual for FREE at the link below...
K301 service
 
Depending on how the machine is wired the likely causes are the ignition switch or the Rectifier/Regulator. does it charge when running? If the voltage running is not higher than battery at rest, it's likely them RR. Could be that even if it charges, but more likely if not.

A meter in series between the battery post and ground will tell you if it is a parasitic drain. Repeat between the Reg's + lead and ground, then ignition switch and ground to isolate.
 
Once I get it on the charger it's runs fine I did notice my lights Dem down when it's running but other than that it runs fine hasn't died on me when I get it running yet
 

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