Taillights

[Rob Rob]

So when locking and unlocking my 2015 sierra 2500 HD the front marker and and taillights come on but dont work when you turn the headlights on but cant find a bad fuse. What else could be the cause???

[JimCost2014]

On ‎7‎/‎17‎/‎2019 at 8:50 PM, Rob Rob said:

So when locking and unlocking my 2015 sierra 2500 HD the front marker and and taillights come on but dont work when you turn the headlights on but cant find a bad fuse. What else could be the cause???

Welcome to the site.

 

OK, some oblivious questions: have you checked the bulbs in the tail lights?

Do your brake lights still work?

When you say front markers, where on the truck are you referring too?

[Rob Rob]

Got it fixed it was a bad marker light relay 

 

[davester]

thanks for following up with what the problem & fix was.