This data off of a jeep web site, I know it's not mopar specific but I thought it was close enough. There's a lot of small loads that add up.

Component....AMPS

Air Conditioner 13.50
Backup Lights 4.20
Clearance Lights - Front 1.18
Clearance Lights - Rear 1.62
Dome Light .97
Hazard Lights 8.40
Headlights 8.40
Heater -Defroster 10.00
Identification Lights - Front 1.77
Identification Lights - Rear 1.08
Instruments 1.00
Instrument Lights .96
Ignition 2.00
License Plate Light 1.18
Marker Lights- Front .54
Marker Lights- Rear .54
Parking Lights 1.26
Radio 2.00
Stop Lights 4.20
Tail Lights 1.81
Turn Signal 4.20
Windshield Wiper - Electric 4.00
Misc Add'l Load 4.00
Underhood Light 2.10
Map Light .97
Glove Box Light .24
Lighted Control Knobs & Ash Tray .34
Cargo Light 1.94


Another important component to consider is the starter. They normally draw about 50-150 amp and can jump as high as 250 amps under heavy load. So voltage drop is something to consider if your battery is in the trunk. If I remember right 5%-6% drop is OK for starters.