How do i find out what is draining the battery in my 1998 dodge conversion van?

[Travis]

i unhooked the negative battery and hooked a test light to it and touched the test light to the negative battery terminal. the light came on i pulled all the fuses one at a time and the light remained on. what do i try next ? any ideas??? help

 

[Eddie]

most likely there is something "on" (a light switch or something)