Hey just a suggestion. I recently purchased a factory service manual for my 2001 on Ebay. I got the huge main service manual and four other books, all factory books for $65. It has detailed electrical prints for the entire vehicle. Plus a wealth of other information. Well worth the investment. Do a search for 1991 Cherokee Service Manual, you'll get a variety of choices. It may take some time to find exactly what you want, but worth the effort. Good luck! Vaya con Dios