On occasion, my Jeep won't start. Lights comes on, power windows work but nothing happens when I turned the key. I tired numerous times this morning, even had a friend jump my battery, but nada. Then in afteroon as I was preparing to call AAA it started. I drove it home (10 miles) and shut it off and restarted it twice with no problem. Usually, if I fiddle with it - like move it, bang on starter (which I replaced a month ago in case that was it) the car will start. This was first time multiple attempts failed. I am afraid next time I will be in the boonies and can't get it started. I had the battery tested and it is carrying a full charge.
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If by lights, you mean the dash lights come on, then ignition switch must be getting power. If dash is not working with key on, check the 30 amp fuse link which powers the ignition switch. If switch is good and starter is good, the start wire from switch goes to, if automatic, to inhibitor relay (the park/neutral function) and then to starter. There is also an inhibitor switch on the shifter or on the transaxle that turns on the inhibitor relay when key is on and shifter in park or neutral. The inhibitor switch is powered by a 10 amp fuse D. If you have a manual transmission, the start wire from ignition switch goes to the clutch interlock relay and then to the starter. This relay is turned on by the clutch interlock switch on the clutch pedal. You can check for power on either relay, the inhibitor relay or the clutch interlock relay, with a test light. Pull the relay out, have the key held in start position. Now both relays would have power showing on two terminals where the relay plugs in. If inhibitor relay only has power on one terminal or no power at all, either ignition switch is not sending power or fuse D is out or the inhibitor switch is not working right. If clutch interlock switch does not have power on two terminals either the ignition switch is not sending power or the clutch interlock switch is bad. If the relay checks are good, check for power on the small wire to starter with key held in start. If you have power there, the starter solenoid must be out.
First, make sure you can turn the engine by hand. If you can't then the starter can't turn it either. Have someone else turn the key and look for the source of the click...may be a relay. Go over the starting circuit with a volt meter. Check for power at the starter main terminal and then with the key turned to "start" check for power at the trigger terminal on the starter. Check battery voltage and check relay operation. You have a neutral safety switch on the transmission if its an automatic and a clutch switch if it's a stick. Check them as well. Make sure battery grounding on fender and block are also clean and secure.