I would also recommend a minimum 90amp alternator. Your factory rated 63amp alternator only puts out that much power at max rpm when cold. When it warms up the efficiency goes down to about 50a.p at max rpm. Driving around output probably about 40amp.
The following are round numbers:
Engine 20amp
Heater 20amp
Headlights 20amp
Radio 2amp
Unknown power for recharging two separate batteries.
Most alternators are cold rated. The special ones are hot rated. Meaning it's tested after its warmed up. I have a 160amp hot rated welding alternator in my jeep.
