How does an ambassador to a foreign country relate to his home government?

An ambassador does not totally isolate himself from the home government; he stays in communication with it. Information constantly flows back and forth because he is an employee of that government, representing it in a foreign country and remaining accountable to it.

Les explains that when a government sends an ambassador to a foreign country, the ambassador does not totally isolate himself. He stays in communication with the home government, and information is constantly fed back and forth, because he is an employee of that government. This illustration follows the teaching that every Grace Age believer is an ambassador for Christ, tasked with letting the world know they have already been reconciled. Les then moves into chapter 6 to show that God did not save us to sit or merely to escape hellfire; we are saved to serve and to be useful in God's vineyard in whatever capacity He gives. Verse 2 then quotes Isaiah: "Behold, now is the accepted time; behold, now is the day of salvation."

2 Corinthians 6:1

We then, as workers together with him, beseech you also that ye receive not the grace of God in vain.

does an ambassador isolate himself from his home government?

No. An ambassador does not totally isolate himself from his home government. He stays in communication with the home government, and information is constantly fed back and forth, because he remains an employee of that government. Ongoing contact is maintained.