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Q: Low beam headlights won't come on. on 2004 GMC Yukon Denali

The daytime headlights and the low beam headlights will not come on. I have checked all low beam and daylight running light fuses and relays in the under hood fuse box, and they are ok.
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Do your brights work? If they do then it is most likely a switch or light module problem. here is a link to an online repair manual site, that will have the wring diagrams to use to inspect your problem.

http://bit.ly/mitchell_repair_manuals_online

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