'99 Grand Cherokee Laredo, 4.0 auto

Daughter left her heated blanket plugged in to the accessory port overnight which naturally lead to a dead battery next morning. Tried jumping without success. Would turn over but not fire. So hooked it to a battery charger the day. Still won't fire. Knowing the CPS in these can fail by looking at it cross-eyed, and having previously had the identical issue in another GC fixed by replacing the sensor, I picked up a new unit and swapped it out. Once done, turned the key, thing spun over, but still wouldn't fire. Did check various fuses and relays and all are conducting when they are supposed to. Gave it a quick shot of starting fluid, turned over, still no fire. So I'm thinking it something in the ignition circuit but not sure how to begin troubleshooting that. Suggestions?