my rear side lamp and tail light won't work in my 06 impala
If only one side is out, it's not a fuse. Check your bulbs. If bulbs are good, take a test light and see if sockets are getting 12 volts. If not, start following wires. Look for cuts, splits, the usual. I would redo the grounds also.
You may have a bad socket and not getting a good ground.
light socket where the light plugs in. Check for power flow up to the socket and ground it to make sure it is not the ground.
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