Please always mention the year, make, model, engine size, and transmission type of your vehicle. Based on the information you have provided, I will provide the following answer that applies to many Chrysler, Ram, and Mitsubishi vehicles.
The Ignition Off Draw (IOD) circuit monitors normal draw from the vehicles' electrical components when the ignition is in the off position. The IOD fuse feeds the memory and sleep mode functions for some of the electronic modules in the vehicle and various other accessories that require constant battery current when the ignition switch is in the off position. This includes components like the clock.
The normal draw for most vehicles is 0.005 to 0.035 amperes. Up to thirty-five milliamperes are needed to enable the memory functions for the Powertrain Control Module (PCM) and other modules, which may vary with the vehicle equipment.
Excessive Ignition Off Draw can be caused by:
- Electrical items left on.
- Faulty or improperly adjusted switches.
- Faulty or shorted electronic modules and components.
- Intermittent shorts in the wiring.
- Aftermarket radio or alarm.
- Totally Integrated Power Module.
You need to keep the IOD fuse installed while isolating the circuit causing the parasitic draw. Before attempting to diagnose the issue, make sure your battery is fully charged, all components are turned off, doors are closed, windows up, and wait at least 30 minutes for all systems to time out. Do not touch the steering wheel. Do not lean on the car and make it roll. Do not sit in the car. All of these actions could interfere with your diagnostic results.
I would start diagnosing each circuit that draws from the IOD circuit using an amp clamp. I would also run the car for a while and see if any DTC codes are present.