It is in the owners manual
If you did not get an owners manual with your truck ( purchased used ), you can download one from Ford :
https://www.fleet.ford.com/maintenance/owners_manuals/default.asp
For the 1998 MY truck, I suggest also downloading the 1997 MY owners manual. On page 142 of the 1997 owners manual is a picture of the mini engine fuse panel, which has 2 fuses in it. Every revision of the 1998 owners manual that I have seen, does not include this info, for some reason.
Also, the aux relay box is documented poorly here is a layout of what is in it, and the engine mini fuse panel showing the PCM KAM ( Keep Alive Memory ) and the trailer tow parking lamp fuse.
Might want to do a save as on this, so you have it, in case you need it.
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