The fact that it is a grand Cherokee has nothing to do with it. The fact that you have an electrical short has everything to do with it. Open the hood. Find the battery. Find the red wire from the battery. Trace the red wire and the wires leading off from it until you find the spot where you can see the insulation removed and there is bare wire. Replace that wire. Hopefully that caught it.
If that did not catch it, then it will be necessary to get a volt meter and find the specific wire that has the short. If it is not is a bare wire, it may be in a broken piece of equipment. You need to find out where. Since you want to learn about your vehicle without working with another back yard mechanic like the rest of us did, that is a possible way. You have to find the short and replace the bad part.
Coolant level is probably low, Have it checked for an antifreeze leak.
No, the Grand is different from the Cherokee.
It keeps the front axle in the correct left to right alignment.
yes it will
No. They are not interchangeable.
No.
No. Different shape.
No, the 1994 has a hydraulic governor while the 1996 has an electronic governor.
Need to know what part you are trying to fit.
No.
YES....
yes