High beam not working

Did you check the fuse circuit for voltage, use a testlite or something.
I posted part of headlamp wiring. You understand your dimmer switch is involved in the circuits.

98 Explorer No High Beams Problem - Ford Explorer and Ranger ...

https://www.explorerforum.com/forums/showthread.php?t=374129

Nov 15, 2012 - 16 posts - ‎8 authors
98 Explorer XLT 4X4 - No high beams. I've read thru many threads here and other places about this. Pulled and checked every fuse - all good ... Fog Lights Off When High Beams Activated - Normal?
19 posts
Nov 30, 2015
Headlights not working (not MFS, Fuses, or bulbs)
12 posts
Feb 24, 2015
97 explorer no low beams high beams
3 posts
Nov 4, 2013
no headlights in 96
15 posts
May 7, 2009
More results from www.explorerforum.com

I suspect it is the headlight switch

check the bulbs first and also the fuses theres a fuse for each side and for low and high beams, start there, good luck.

have you checked the fuses under the hood?

If you have not replaced the headlamp with HID, the next thing, are the high beams on ?

If you turn the high beams on, the indicator lamp on the main headlamp switch should go out.

Next thing would be to check the fog lamp relay in the fuse panel ( passenger side kick panel by the fuel inertia switch ).

The fog lamp relay is a half size ISO relay, you should be able to swap with the trailer tow parking lamp relay ( R201 ), to test with.

The fuse you checked is the F17, the fog lamp fuse for Relay R202, correct ?

The problem could be the headlamp switch.
You are right about the fuses.There is one for the LH high/low and one for the RH high/low.
Have you tried turning on the lamps manually with the switch?

You headlight lamp have a diffuser mechanism which allows it to flip between the hight beam and low beam feature of the bulb. In fact, you high beam will function even if the low beam is not working.

I would recommend the purchase of the new headlight lamp. It would cost you you any where from $15.00 per unit to get a replacement lamp