Yesterday I tried to change the rear side markers to LED lights. I put them in and they didn't work. I put back on the old ones and now they won't work. All the other lights work. Any clue as to what could be the problem?

 

test for volts at the light outlet. check fuse. so all the other parking lights work?

 

Yep. All other lights work

 

look inside the plugin to see if the little connectors are sticking out far enough to make contact with the wire/metal on the bulbs. sometimes they get pushed in and wont make contact. same with bulbs.

 

Check for corrosion of bulb socket contacts and use something to scrape them like a small flat screwdriver -- shine up the contacts as best as possible, and add a little dielectric grease when you reinsert the bulb.

 

There really isn't enough information here to answer the question to the problem. Why did Chevy101 change to LED side markers?

Did they use CAN bus LED's which are for 05+ or ?

Did you replace the old lights with new ones?

 

It's fixed. There was corrosion built up on the sockets. I used sandpaper and now it's working

 

kool, cheap fix is good. led lights draw less amps and make more and imo better light.