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2004 - 2008 F150 2004, 2005, 2006, 2007 and 2008 Ford F150's with 5.4 V8, 4.6 V8 engine
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Old Sep 11, 2015 | 11:13 PM
  #1  
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ok so here is the deal. i have a 2004 ford f150 heritage edition. This evening i installed some new Sylvania headlight bulbs. I noticed when i went to drive my truck this evening i had no dash lights, running lights, and brake lights. On top of these two problems my headlights were staying on even when i turned the switch off. I am wondering if these new headlights are too powerful or what. I did a spot check on the fuses and they seem to be ok, but i am going to put a test light on them tomorrow. Any idea on what is going on?
 
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Old Sep 14, 2015 | 10:07 PM
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I would unplug the new head lights and check the dash/ tail lights again.. It sounds like a light switch problem, but possibly tied to the head light plug in ? Try dash / tail with NO head lights ....... check plug in ...switch may be a concidence.
 
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Old Sep 15, 2015 | 07:34 AM
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More information is needed.

Which SPECIFIC Sylvania bulbs were installed?

Is the truck equipped with auto-lamps, DRL, or both/neither?

Are all of the following out of operation? Low beams, high beams, flash to pass?

Does the high-mount brake light still work or not?

Do the turn signals and emergency flashers still work or not?
 
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