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Hello I have a 2007 gmc 2500 classic. For the past few months my passenger side headlight has been very dim. Also I get a turn signal on message on the dash when the turn signal is not on. Yesterday the blinker started blinking fast so I figured there was a bad bulb. However it doesn’t do it all the time and sometimes works normally. Then today I went to use the blinker and it got stuck on! While it was stuck on there was a loud buzzing noise almost like low horn noise, I also here this noise for a short period of time everytime I turn the key to let the glow plugs warm.
This all leads me to believe I have a bad ground somewhere, I was wondering if there was a list of all the locations for grounds that could effect this circuit?? Sorry for the long post any help would be greatly appreciated!
 

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