Choose the eighth quest in ACT 2. Enter an area with a Guardian Tower. Go in the corner and just afk. Works best with more gold find %.
1. Ensure 2 pillars so that you can farm the mob constantly
2. The gear must have thorns stats
3. Use Templar as pet and enable heal skill
4. Repair your gears and then go to sleep
5. When you get up, pick up the gold and go back to town to repair your gears and repeat the steps.
AFK as Wizard:
This is what I was using without a follower. By using Storm Armor with Reactive Armor and Magic Weapon with Blood Magic I could AFK also while I was gold farming.
While testing this out before I made my post I got 150,000 gold and a couple rares in under 2 hours.