melee attack? Resource generator u mean?. You will need 6 Akkhan bonus to allow you perma Akarat. with 4 piece akkhan bonus, skill cost -50%. also wrath regen is higher during Akarat form. If still not enough, use Law of Valor (Unstoppable force rune) and if still not good enough use Long Arm the Law passive. Some skill like Provoke, Shield Glare can give wrath too..

without melee try blessed shield or phalanx stampede build, my current build is blessed shield build but the damage quite suck due to some low legendaries gear my profile > http://us.battle.net/d3/en/profile/huoshen...7/hero/44703347

Crusaders usually go for high cooldown reduction so that can maintain permanent or near-permanent Akarat's Champion. And also Laws of Valor with Unstoppable Force rune. Akkhan's set is not crafted, but drops in Rifts, Greater Rifts, anywhere/randomly in the world in Adventure Mode (say for example when you doing bounties), and also can obtain via gambling at the NPC Kadala. You may pay attention to the set bonuses of Akkhan's as well to have an idea how people spamming Wrath spenders without having any Wrath generator skills on their skill bar.

1. Akkhan's set bonues - can view them on my crusader here http://us.battle.net/d3/en/profile/Mjolnir...3/hero/19711692
2. high cooldown reduction to maintain perma or near-perma Akkarat's Champion
3. using other skills that give you wrath (mentioned by others above already)

Now, go and read what they're for then you may understand a bit more.

the best build for crusader now

1. Unrelenting Phalanx
best weapon ancient furnace, ancient Heart Slaughter, ancient Baleful Remnant.... if cant get 1 of this weapon, u can use any 2hand weapon with high damage...



2. Frydehr’s Wrath
u must have this weapon Blade of Prophecy



gear,
akkan champion set + rorg + leoric crown
u mush have 55.6% cooldown reduce

this belt better than Vigilante Belt... try get 6 sec.... by teh way, if u cooldown not 55.6%, u need vigilante belt...

if u still cant find this set, follow this video for beginner, and fast way solo farming gear..
https://www.youtube.com/watch?v=NXF4wMYFdW0