You can find a wiring diagram in HAYNES Jeep CJ AUTOMOTIVE REPAIR MANUAL. This manual covers 1949 thru 1986 - all models.
Most Jeep dealerships will give you a free 1994 Jeep Grand Cherokee wiring diagram. You can also find the wiring diagram in most Jeep service manuals.
You can find a spark plug wiring diagram for a 1998 Jeep Cherokee in the vehicle owner's manual. You can also find the diagram at various auto stores.
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http://66.34.72.138/wiring/index.html Have fun!
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A person can find a wiring diagram in the cars maintenance manual. Other wiring diagrams can be found in the cars repair manual as well.
Go to your Jeep dealer service department. Politely ask for a copy of the wiring diagram you need. I've done this several times with success.
Using the search term " 2004 jeep liberty wiring diagram" in Google, it displays an oversized image. If you click on the image, it goes to a website where you can save or print it.
www.installdr.com , That's it Brother.
You can find full wiring diagrams for free here: http://oljeep.com/gw/elec/GW_wiring.html