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hello,
first thing is to check all your fuses and make sure that they are all good? the next thing is to check if you are getting tachometer signal as you turn over the engine? if you are not getting tach signal the you should change the (crank sensor) in order to make the engine gets spark and the fuel pump to operate. if that does not work then you have a wiring problem and or possibly a bad ignition switch or computer malfunction.
In the 04 models there has been a recall on a part in the brake lights. You can look it up and it gives you a number to call GMC. If you truck is one of the affected models they will replace it for you.
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