2010 Gmc 1500 Signal Light Issue

[L29er]

got a new canopy installed by a truck accessorie joint, so they tied into the LH tailight for marker lamp power to the interior light of the canopy, and for the brake light in the canopy.

 

now the LH signall flashes really fast, and the LH upper bulb (the one they tied into) has no park light (doesn`t light up for park lights, but does signal and brake.....

 

they said they used a module of some sort, and have done this a million times but of course this has never happened before, they returned it back to factory and it is still the same, its clear they Fwonked something up, but does anyb ody have some ideas? i changed the bulb and checked all fuses, still not working properly. :facepalm:

[Stevens03]

Good lord Take it back and make them fix it! They screwed it up.

[700 sportsman]

So it flashes like a bulb is burnt out?

Could the bulb have burnt out one filament? I don't see the need for a module while tapping in for power, but if that's what they do.

 

Other than that, I don't have any ideas

[L29er]

well they can`t get it fixed, forced to take it to dealer, i tried changing the bulb, whatever the fix, if its not warranty the place better pay for the repair or my company wil no longer do any business with them ever again.