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YOU NEED THE LIGHT SOCKET.UNFORTUNATELY THAT PART IS NOT AVAILABLE AT THE DEALER OR AFTERMARKET.THATS WHY THE DEALER WANTS TO SELL YOU THE LIGHT ASSEMBLY BAR.THE SOLUTION IS TO GET A USED ONE AT THE AUTO WRECKAGE OR SIMPLY SWAP THE SOCKET WITH THE REVERSE LIGHT SOCKET AND THAT WILL SOLVE YOUR PROBLEM.BOTH SOCKETS USE THE SAME LIGHT BULB #3057.
If the bulb where burnt out the turn signal would flash faster than normal. I can't imagine that all four bulbs would be burnt out as Thomas suggested. This would be the only possible way that the bulbs would cause the turn signals to completely stop working.
Here is what I would suggest. If the turn signal arrows in the dash illuminate along with all the turn signal bulbs but they just don't flash than replace the flasher.
If nothing illuminates than than first male sure that the tunr signal fuses are good. If they are let me know and i'll get you some more diagnostic info. It is still likely the flasher but it isn't that difficult to check out to make sure.
The circuit board needs to be replaced. Which is the board that the bulbs sit in. If you remove the turn signal bulb. You will notice the bulb socket will be slightly burnt inside. I had the same problem with my 99 Denali and replaced the circuit board for $35.00. Now everything is fine.