I posted this a little bit ago, but it didn't show up in the forum for some reason...

Coming off of the positive wire on the battery, there is a hard black plastic cylinder....the wire goes into one side and out the other. In addition, there is another wire that goes into the cylinder at one side, and another that goes into it on the other side, How in the heck do I get into this thing, I have a broken wire right there that I need to fix....it's to power my radiator fans...and advice?