If you buy an afermarket light kit from someone like MadJax or others, you will need a 16V-12V reducer that plugs into the factory harness or you can get a 48V-12V reducer. I have a 2010 precedent I2L Excel, serial number starts with PD, and it has the madjax light kit. You have to install the bucket harness and the reducer. You can check the installation instructions at:
http://www.mymadjax.com/file/BucketH...all2011Rev.pdf. The plug and play voltage reducer is here:
http://www.diygolfcart.com/Club-Car-.../volt-0011.htm. It plugs right into the factory harness.