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: low beam head lights won't work
Check your relay switches under the hood fuse box. They should be a light grey from factory, they are about 1 x 1" in size and there are a few in there. Pull one out at a time and if they look brownish or yellowing replace. Go to Napa or Auto Zone for $15.99 a peice that most likely will fix it.
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: low beams don't work - both out at the same time.
DID YOU CHECK THE BULBS?
Testimonial: "spot on."
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