Electrical problem
2002 Jeep Liberty 4 cyl Four Wheel Drive Manual 106000 miles

a couple months ago i installed a battery in my car with the wrong configuration and when i hooked the negative up it sparked and the wiring assembly next the fuse box started smoking i realized what i did and disconnected it and went and got the right battery then i started the car and it overheated so i ended up blowing something with the radiator fan. i got the radiator fan replaced and it seemed like everything was ok then one weekend i didnt start the jeep and went to start it monday morning and it was dead i got it jumped and it seemed fine but then it started getting worse now if i dont run it at least every 8 hours or so depending on how long i run it it will die there is a ticking sound coming from the radiator fan and you can visually see it pulsing i have a suspicion that i shorted a wire but have no way of knowing and i don't know where do get a new wiring harness if needed i know its not a fuse i checked them all and none of them are blown so i was wondering what it could be if not the wiring harness and how to replace a wiring harness if thats what it is thanks soo much in advance