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Having an issue with headlamp bulb connection.  1st off truck is 2015 Sierra 2500 Denali, using a volt meter and headlights on in manual I get 13.84volts, plug in headlight bulb.  It flashes on for like 100th of a second then nothing.  Check voltage again and it's at 6.82volts.  What would cause this, is there a bad relay or something?  Totally stuck and cant figure it out.

 

Any help or suggestions are greatly appreciated.

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