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Take your car or cars vin number to the local dealer. They will printout a light and electrical wiring diagram. While there - as about RECALLS - you will be amazed at the out standing recalls people pass over.
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Do you know how to do basic automotive electrical testing ? How to read a wiring diagram ? Videos on youtube on electrical testing and how to read a wiring diagram .You can find free wiring diagram's fuse box layout etc... at http://www.bbbind.com/free_tsb.html The only way to find this problem is by testing . Electric Testing Techniques You Need to Know
CHECK FUEL PUMP AND FUEL INJECTOR FUSE.IF FUSE IS GOOD.YOU NEED A NOID LIGHT TO CHECK TO SEE IF INJECTORS FIRING.YOU CAN BUY A NOID LIGHT AT ANY AUTO PARTS PLACES.WHAT YOU DO DISCONNECT FUEL INJECTOR CONNECTOR.HOOK NOID LIGHT TO CONNECTOR.CRANK ENGINE TO SEE IF NOID LIGHT BLINKS.IF YES INJECTORS FIRING.IF YOU GET STEADY LIGHT.PCM NOT WORKING NOT FIRING INJECTORS.IF YOU GET NO POWER OR LIGHT DONT WORK.YOU HAVE A WIRING PROBLEM.YOU NEED A HAYNES REPAIR MANUAL LOOK AT THE ELECTRICAL WIRE DIAGRAM.TO TRACE FAULTY WIRE.
This link should provide all the diagrams you need http://www.google.com/search?q=1989+jeep+comanche+wiring+diagram&sourceid=navclient-ff&ie=UTF-8&rlz=1B3GGGL_enUS249US254.
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