GMC Troubleshooting Questions? Ask a Mechanic for Answers
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do you have a good multi meter on hand to test for mili amps ?
if the battery s confimed good with cold cranking amps and hs NO bad cells then 99 % of these 2004 trucks when they have draws are the radio or the BCM or the gauge cluster doing the draw
usually what you can do is unplug the radio and see if it still does this if it does unplug the gauge cluster if it still draws unplug the BCM which ever one you leave unplugged and the draw stops tht is the device that is bad
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no you need to unplug it to be sure
( body control module )