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.
Definitely check your fuse. My 2006 Impala has a fuse for the right side and left side parking lamps. My rear tail light was out as was my front amber parking lamp. Checked the manual for fuses and found out that the fuse panel inside the engine compartment has a fuse for right side and left side lamps.
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