How do i replace the socket in 2004 4runner blinker?

Was it a dual filament bulb?

Test for power and ground to the socket .

Hey Derrick,
I do not think the blinkers have a "right" and "left" fuse...Its usually a flasher/blinker relay.
Try replacing the bulbs.. make sure their sockets are clean and able to hold the bulbs tight. If you are not getting both right side blinkers to work and you know both bulbs are good, the switch in the column may be the culprit.

2003 GMC ENVOY 4 2L L6 Turn Signal Switch RockAuto

Turn signal/Flasher
2003 GMC ENVOY 4 2L L6 Flasher RockAuto

Bulbs/Sockets
http://www.rockauto.com/en/catalog/gmc,2003,envoy,4.2l+l6,1415269,electrical-bulb+&+socket,turn+signal+lamp+bulb,13675

Check for a bad ground at the bulb socket.

Check the front socket where the bulb goes. Those cars are known for overheating the sockets. Take out the bulb and look inside the socket, it will probably look burnt, as will the contacts on the bulb itself. The socket is replaceable and available everywhere

You have a ground connection intermittency issue. Check the blinkers socket clean rust and retghten

black wire at socket is always grounded. on the LR the light blue wire should be hot, blinking. the socket could be bad.

CHECK TURN SIGNAL FUSE.THE FUSE BLOWED WHEN YOUR BULB SOCKET MELTED AND SHORTED OUT.

Make sure bulb replaced is the required 2 way or 1 way. If you're sure you put in the right bulb type (1 way or 2 way) 6 or 12 volt.. bulb model marked on side for replacement (Check carefully). Assuming its the right bulb type and still blinks fast, you will have to replace the socket. Sockets do get corroded and worn. Disconnect the battery, cut positive then cut negative. Wire up new socket same way using wire connectors. Tape up connections after.
Should then work.
Make sure before you do this you have the right bulbs in all sockets (front and rear) and that all lights work 1st. One failing light front rear same side can cause this problem.
Go to a scapper to get a socket.. just cut it off a wreck... take a couple of them. There cheap.
Good luck

ok, it sounds like you have a blown bulb. Replace the light bulb and see what happens. If you do this and it still doesn't work look at the socket that the bulb goes into. if you see and green corrosion then the socket should be replaced.