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Any advice would be greatly appreciated on this.
Yesterday the truck wouldn't start. It would jump start fine. We replaced the battery thinking this would fix the problem. Now the truck won't start. The dash lights come on but only one headlight comes on. Any suggestions on what to check?
 

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2020 GMC Sierra 1500
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"The dash lights come on but only one headlight comes on. Any suggestions on what to check? "

Assuming the battery you put in is new and not defective, I would want to be sure the ground cable to the battery is not corroded and is clean and tight on both ends. If both headlights were working before, and now only one comes on, there is for sure a grounding problem somewhere.
 
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