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Im having some interesting problems with a 92 cherokee I bought about a month ago. The battery and starter are both good. Its got power, and the fuel pump kicks on but the engine wont even try to turn over. Sometimes if I pull the starter and battery, then clean up all the connections and reinstall them I can get the jeep to start a few times but the problem comes right back. Any Ideas?
Thanks in advance.
 

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How much voltage does the battery have?

How much voltage does the starter solenoid have?

How much voltage does the starter have?
 

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Usually, the cause is a bad neutral safety switch. (Assuming you have the AW-4 automatic)

The switch can be easily removed, disassembled and cleaned from under the vehicle without disconnecting the wire harness. The switch is held to the transmission with one 12mm hex head bolt and a large nut (7/8"?) that needs to be loosened before you can remove it from the passenger side of the transmission. There are six or seven phillips head screws that you take out, then split the switch in half. There is a black plastic wiper lever in there that has two small spring loaded copper blades that get stuck in it from the grease drying up in the switch. Use some brake parts cleaner or mineral spirits and some scotchbrite to clean up the contacts and free up the spring loaded contacts in the wiper arm. Regrease with dielectric grease or white grease, and reassemble. When you install the switch, match up the old bolt marks before you tighten the 12mm bolt. Check the adjustment, you should only crank in park or neutral, and the reverse lights should only come on in reverse.

A new switch costs over $245!
http://www.oreillyauto.com/site/c/d...=Search_02035_1180055_3046&pt=02035&ppt=C0039

Hope this helps!
 
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