1998 ford f150 no power to lights, radio,etc but the heater blower works, not the fuses

SOURCE: 2004 Ford F150 - AC/Heater blower speed 1 & 2 not working.

You might have a bad speed selector switch, or your blower motor resistor is faulty.

SOURCE: Ford F150 2005 Fuse Box?

You can download the owners manual directly from Ford. It has the fuse box diagrams under the emergency roadside section

https://www.fleet.ford.com/maintenance/owners_manuals/default.asp

SOURCE: 1998 Ford F150. windshield wipers,interior

check to see if you have corrosion in the fuse box or the GEM module, by removing the fuse box completely, disconnect the battery, take out the two screws and two 8mm bolts that hold the fuse box in, it will take some maneuvering to get it positioned right to disconnect the two wiring harnesses from the fuse box, they are bolted through the middle. Once removed, take the GEM module off the back of the fuse box and look for what would be something like the same corrosion you would see on your battery posts, usually one of these components is corroded and causing the problem, my buddy got a replacement fuse box for his from a wrecking yard for only 15 dollars, with all the fuses and relays. If you have this corrosion, then you probably have a windshield leak at the lower left hand corner of the windshield, it lets water drip onto the fuse box and GEM module. Hope this helps, let me know

Testimonial: "Mr. Guru, It was the GEM module. Thank you for helping with my problem. "

SOURCE: 1990 Camry Fuse Diagram. The following suddenly

REPLACE BUSTED FUSES

SOURCE: My heater blower isn't working. Which fuse do I

the heater/ac fuse look in your owners man. it should have a diagram or give you a number.

Testimonial: "Thanks. I actually looked in the manual and saw a fuse listed for AC; didn't know it was the same one for the heater."