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.
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Autozone
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The wiring to the horn is shorting out at times. Check the horn relay, and the wiring to find where the system shorts when the Jeep brakes.
maybe not free but cheap at the junk yard
A person can find a free wiring diagram for this car in the maintenance manual. It is possible that an auto tech will print off the diagram for free.
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.jeepforum.com lots of help from the members.
I don't now of free but on www.eBay.com.au in the jeep area you can get a work shop manual on CD for about $12.
1993 Jeep Cherokee Ignition Wiring ...