My 2003 escalade died while on the highway now won't start battery good! But turn the key and nothing happens?

Hello<I am Ron.Be sure the battery is good by checking,or having it checked.Check the cca,and load test.If this checks out,then proceed to look for bad terminal connections and then either a burned out fusible link,or large maxie fuse.Fusible links look like a wire,but will pull apart like taffy if the are burned out.Look near a positive wire junction,most likely near battery.The fusible link will be attached there.Be sure if the battery checks bad,to check the alternator,or have it checked.If I can help,let me know.>>[email protected]