New Mechman alternator 240a

BassHead50008 Newbie
So I have the big three done in my car.
Setup diagram is:
1. Power wire alternator to battery
2. Negative wire to chassis of car
3. Wire Motor block to chassis (layered factory wire)

so on the new alternator there is a positive and negative to the battery. Do I need to change the negative to battery or can I keep the negative to chassis, what is more recommend? My ground is very short and if I need to run it to the alternator that would make is as long as the power wire. Let me know guys appreciate it!
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