These trucks are known for bad multifuction switches.
the switch that i talk of is the signal switch , the handle is the switch, it bolts to side of steering column . this switch controls the signals and the headlights and high /low beams. the other thing is the headlight switch connector, the connector some times goes bad and starts to melt or just comes out of the connector. you will need to remove the cover to steering column, the screws are located under the bottom cover in holes. remove cover and check connector and then test for power if you have power going into switch but not coming out then switch is bad.
the last thing is to make sure the bulbs are good , make sure the headlight bulbs are good , and also the driving light bulbs, test for power at the connectors to those lights to.
You will need to do a little testing to find the problem.
Check out related help links with solutions to troubleshoot these problem:----- http://repairhelpcenter.blogspot.com/2012/01/passenger-side-low-beam-out.html -----------
Click the link below:---
Low beam headlights Modification?
http://schematicsdiagram.blogspot.in/2012/04/low-beam-headlights-modification.html
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DRL and Low beams not working?
http://schematicsdiagram.blogspot.in/2012/04/drl-and-low-beams-not-working.html
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Passenger side low beam out?
Low beam HID light goes out?
http://schematicsdiagram.blogspot.com/2012/01/low-beam-hid-light-goes-out.html
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2007 Dodge Caliber: Low Beam Headlight Not working
http://technoanswers.blogspot.in/2012/06/2007-dodge-caliber-low-beam-headlight.html
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Chevy Tahoe: Low Beam Lamps are not working?
http://technoanswers.blogspot.in/2012/04/chevy-tahoe-low-beam-lamps-are-not.html
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2001 Chevrolet Tahoe: Both Low Beam Lamps Not Working?
http://technoanswers.blogspot.in/2012/04/2001-chevrolet-tahoe-both-low-beam.html
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2002 Toyota Tacoma: Low Beams not working?
http://technoanswers.blogspot.in/2012/04/2002-toyota-tacoma-low-beams-not.html
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These will help.
Thanks.
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: I have a 04 Envoy and the day-time/low beam lights won't turn on
hi beam/lo beam/DRL may be on separate fuses. Check your DRL (Day Running Lite) fuse
SOURCE: 96 ford explorer headlamp quit working on low beam
check for power at the bulb socket also check for poor contacts in the socket
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