Do you still have a manual in the truck? If so it'll tell you what the fuse goes to. If not you may need to either,
a. Post a pic of the fuse box and the location of said fuse as they used a couple differant configurations. That way we can see what you are looking at.
b. Get a manual or a hayes/Chilton book.
Or..
c. Search Google for a 1998 k1500 fuse box that looks like yours and see what the particle fuse is listed as.
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