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.
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.
1993 Jeep Cherokee Ignition Wiring ...
The 1990 Jeep Grand Cherokee power locks wiring diagram can be obtained from most Jeep dealerships. The wiring diagram can also be found at most auto-parts stores.
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Autozone
You can find a wiring diagram in HAYNES JEEP CJ AUTOMOTIVE REPAIR MANUAL. This manual covers 1949 thru 1986 - all models.
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.
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that isn't a question
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.