I just buy an 04 sierra and started to blow all the break lights and lic. Plate lights I unplug it and it stoped blowing all the bulbs. But i've never seen something like this before and I need help. What does it do? And what is it?

 

hard to say without seeing what it actuates. pan out and post another pic

 

I will try to take more pictures. But it was pluged to the break pedal. And is under the passenger side under the dash. I dont think is factory equipment. Tnks for trying tho. I'll keep updates on what I can find

 

its definitely not factory. what is the solenoid actuating; follow the linkage. Is your truck a diesel?

 

Update?