git detecting .sj files as binary and can't see changes in the file

Hi, 

   I've run into an issue where when I commit my files in git I can't see the changes from the previous version of the file. I assume this is due to git considering the file as a binary. Has any one else run into this issue? If so how did you resolve it? 

I've tried changing the encoding of the files, adding to gitattributes but did not  allow me to diff files.

Thanks, 

  - J