SOURCE: high beams wont turn on.
First place to start is with headlight switch. I did have a case many years ago when both high beams were blown out at once, but this is rare. When you have the headlight switch out, jump power from te low beams to the high beam contacts. If high beams come on, replace switch.
Bill
SOURCE: headlights flickering
This could be caused by a lot of different things,,but usually it is the fault of the Headlight Relay.
Try replacing the relay before going further.
SOURCE: My low beams work on my headlights but my High beams wont come on
Take a look at this link regarding DRL system. I know it's not exact truck but most of it would apply to yours too. It should give you hints on what to test & how.
http://www.fordf150.net/howto/drl.php
SOURCE: 2001 Ford Focus - High beam / low beam problem with headlights
just replace the dimmer switch under the column its wore out on the low beam side
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