2006 Chevy Trailblazer Engine Diagram ✓ All About Chevrolet ... Chevy Trailblazer Wiring Diagram Source · Chevrolet 5 3 Engine Diagram Radio Wiring Diagram2006 Chevy Trailblazer Engine Diagram - Get a good-quality voltmeter or multimeter and test your battery’s state of charge. The voltmeter should read around 12.6 volts with the engine off and 14-15 volts when the engine is running. If voltage is below 13.5, there’s a good chance the alternator is not keeping up with your battery’s charging needs.. Sorry but this item is currently unavailable. Please check back at a later stage. ×.