2010 Express won't crank, dash dies

With a good battery when the key is turned to start the dash dies (only the engine light is lit) all gauges and other lights die. No other sound except a small relay in the dash and no crank. Headlights do not dim. No problems leading up to this. 54000 miles and is a RoadTrek conversion but think this is a Chevy problem.

Does the crank relay click when the key is in the crank position?