So.. i have a mark 6 fiesta zetec s, and i was trying to change my side bulbs and i put led canbus light in it and it lit for a 6-7 seconds and it went out. I tried putting the old one that worked in and now it doesnt work with any lights i have. Same happened with the other side. What did i do and how do i reverse this *****, i tried with a screwdriver to tighten but no luck

 

Did the canbus type connection burned the switch. I really hope this is not it, because i wouldn't know how to go around changing that

Check fuses

I dont know which fuse it is, i see now that when i turn on my headlights the rear doesnt light up only when i press on the brake so it gotta be the fuse

The Mk6 Fiestas have a useful picture diagram next to the fusebox.  Look for the picture of sidelights, same as the dash picture (2 lights facing away from each other).  Possibly F22 but depends on year and spec.

Already found them bro, but thanks for the fast replies. Ive seen both of them are burned. Do fiestas dont support canbus because they were on my reverse lights and they worked there perfectly.

Rubbish bulbs, better quality bulbs will be better

I have these in my MK3.5 Interior lamps, my god they're bright

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I put new fuses but they blew out the second i turned on my headlights, any help is considered

Sounds like something is a dead short to ground

Put the old bulbs back in and try again.  We need to confirm whether it's the bulbs at fault or whether you may have trapped a wire during fitting to cause a short as above.  As it's both fuses, it does sound like the bulbs are the problem.

It was wires touching i put electric tape on them and now its all good.