One problem related to fuses and circuit breaker has been reported for the 2004 Chevrolet Trailblazer. The most recently reported issues are listed below.
"service engine soon" light would flash on then immediately off, truck would feel like it momentarily lost power while driving. Recently the fuses for all the gauges have been blowing out repetitively. The speedometer does it more than the others. Have replaced them several times in the past three months. Chevy was helpfully "guessing" at first but finally told us there was nothing they could do towards the end of our 3 year warranty. We haven't taken it back to them for the ongoing problems.