As stated disconnecting the connection to the heat sink on the drivers side panel will disable the DRL's but not the auto light feature. To disable the auto light feature there is a fuse behind the glove box that you need to pull. I forget which one. Did it awhile ago. That disables the auto light feature and allows you to manually control your head lights. I did this on my 99 and it works great.
I forgot to add that this works for 97-99 and some 00's. Some 00's and up are different and this does not work. Refer to this site for more info that will work for all years.
http://www.backinblackgp.com/DRL_TS_Kill.htm
