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Common problem.Most likely a blown fuse.Whenever I do an emissions test on an Escalade or Suburban with this problem I always check the fuses.Ten out of ten times that is the problem.This fuse also powers the cig lighter/power ports.If it blows again check the outlets.Especially center console one.A lot of times a coin is dropped into it and shorts out the port.Get a test light and with key on check all the fuses.Should be located in the engine compartment on the drivers side.To check fuses connect the test light to a good ground and then touch the lead to each side of the fuse.If only one side lights up then that is the bad fuse
Get a test light/ fuse tester and check every single fuse you have (including the ones under the hood). You're on the right track. It's very, very likely to be a fuse somewhere, if you've verified every one of your bulbs are good.
I've got a 2003 Suburban that has two fuse panels, one inside under the steering wheel and another under the hood, drivers side behind main battery. All lighting fuses are under the hood, Plastic cover with battery symbol pulls up to remove, should be a panel schedule inside the cover. The tail light fuses are in upper left section labeled RR Park and LR Park.
First check all your fuses if you haven't already, the ones under dash and the ones under hood, if they are all good it is more than likely your heater core, if you need instructions on how to replace this part let me know and I will send you the info!
now that the fuses are eliminated you need to check the flasher relay which is located under the hood. there is also a secondary relay located on the fuse panel you already inspected. if neither of these fixes it then it is likely that the switch may have gone out. good luck.
I am assuming you checked your battery already. Go under your hood to the fuse panel, Pull out the IOD fuse for about 10 minutes and replace. Try starting your car after that. If that doesnt help you may need to check your distributor or power coil, If thats good check the crankshaft sensor.