[bobss396]

You don't need a test light. You can do the "pull the fuse" trick, just disconnect the battery nagative terminal and strike it against the battery post to see if it sparks.

This is best done in total darkness, also lay a damp shop rag on top of the battery so the spark won't light off any gases. I've done this many times and it has always identified the offending circuit for me.

While you're hanging out in the dark, look under the dash and around the glove box to make sure the light is not on for some reason. If you have anything wired direct and unfused/unswitched try to eliminate that as well.

Bob