In part 3, Montag travels to Faber's home after killing Captain Beatty and destroying the Mechanical Hound. When Montag arrives at Faber's home, Faber is surprised to see him, and Montag explains that he is a wanted fugitive on the run. Montag then informs Faber that he plans to continue running from the authorities, and Faber gives him valuable advice. Faber tells Montag to head towards the river and follow it until he reaches the abandoned railroad tracks in the country. According to Faber, there are several hobo camps around the abandoned tracks, and Montag would benefit from joining their group. Faber explains that the hobos are former intellectuals and are society's outcasts but manage to survive because the government does not consider them a serious threat.

Montag takes Faber's advice and sprints towards the river after he covers his scent at Faber's home. Montag manages to escape the second Mechanical Hound and dives into the water before the authorities can arrest him. Throughout the night, Montag floats down the river and washes up on a bank a considerable distance from the city. He follows Faber's instructions and travels down the abandoned railroad tracks, where he eventually joins a group of hobo intellectuals, who welcome him with open arms and help him remember the Book of Ecclesiastes.

In the book Fahrenheit 451 what does Faber advise Montag to do?

Faber is suspicious when Montag comes to call at his home. He does not want to hear Montag's plan and interrupts him by suggesting his own plan of subverting the firemen themselves. He says:

The only way I could possibly listen to you would be if somehow the fireman structure itself could be burnt. Now if you suggest that we print extra books and arrange to have them hidden in firemen's houses all over the country, so that seeds of suspicion would be sown among these arsonists, bravo, I'd say!

When Montag immediately embraces this plan, Faber backs off and says that he was only joking. Montag, however, persists. He says he will support the plan if Faber really thinks it will work. Because Faber sees that Montag is earnest in wanting to do what he can to fight the system, he reveals that he is enthusiastic about the idea of fighting the firemen:

"It's an insidious plan, if I do say so myself." Faber glanced nervously at his bedroom door. "To see the firehouses burn across the land, destroyed as hotbeds of treason. The salamander devours his tail! Ho, God!"

He then hesitates again, saying such a plan is foolish. However, after Montag starts to destroy a Bible, he agrees to back him up rather than see more books perish. This time he suggests that Montag wear the Seashell transmitter in his ear so that he can advise Montag from afar.

In the book Fahrenheit 451 what does Faber advise Montag to do?

Since you have tagged this with "after Montag arrives at Faber's house" I'll talk about that part of the book.

Faber starts off by telling Montag that just books are not enough.  He says that people need books (good books).  But they also need the time to read them and the right to act on the ideas they get from the books.  He says that their society is so messed up that just planting books in firemen's houses won't do much.

So he suggests that Montag should wait until war destroys the society they live in.  Maybe then they can build it back in a better way.  In the meantime, Montag should wear the "bullet" so Faber can help him out (especially when he has to deal with Beatty).

In Fahrenheit 451 how does Faber give Montag wisdom?

In Fahrenheit 451, I see Faber give Montag wisdom in 3 ways.

First, he physically puts thought into his head. The ear piece Montag wears in an effort to know what to do when he performs his acts of rebellion is a symbol of the wisdom Faber places in his mind. It is as if an all-knowing god comes into Montag's mind and gives him what to do when.

Second, Faber directly instructs Montag in the art of reading. Faber clarifies what thought and truth actually are. Montag begins to believe that there is something in books that must be known. Because Montag is not a reader, nor does he really analyze, he does not know how to read and consume or digest thought. Faber gives him three purposes for reading: quality of detail, leisure to digest, and the ability to act upon what is read.

Lastly, Montag is ready to act. He can achieve the third directive of reading, he just doesn't know how to be the respecter of detail, or digester of thought. It is as if Faber performs the actions Montag cannot for him while Montag does the third for Faber.

All of these steps result in Montag actually gaining wisdom for the duration of his life after his escape because he then gets to experience the group with Granger, a people who do think and talk and process and value wisdom the way it was.