does it sound like the battery needs to be replaced?
Is the starter making any noise at all, like a click? Do the headlights come on? Instead of jumping the battery, why not just swap the batteries for now if it will fit and try that, then you can use the other vehicle to charge that battery if dead, just start it up first before you remove the battery. It may be best to purchase a 12 volt test light, they cost about $5, then you can test the wiring.
Here is the wiring diagram for it here. http://www.autozone.com/autozone/repairinfo/repairguide/repairGuideContent.jsp?chapterTitle=Starting+%26amp%3B+Charging+Systems++2002&partName=Wiring+Diagrams&pageId=0900c15280242136&partId=0900c15280241b4d
You may need to register for free.
I do see first off a Starter fuse 30A in the underhood fuse block.