High beams won't shut off
Relay contacts probably fused together or dipswitch fault
SOURCE: 2003 Ford mustang High beam switch
The dome lights are not related, but the high beam problem is the steering column mounted multifunction switch, very common problem, they should recall them.
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: 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: I have a 1999 ford explorer sport and low beams not workiing.
replace driver module relay .it controls the low beam lights.
SOURCE: The headlights on my 1994 ford taurus sedan are
the lenses are most likely clouded over? yellowed? sometimes you can buy a kit to polish them, but I would recommend replacement, polish doesnt last long, and you will need to replace them anyhow. the DRL lights are operating normally
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