This is my first post here, I have a 98 TJ with the 2.5L. I have a random problem where my jeep will not crank (turn over) whatsoever. I sometimes hear the solenoid on the starter click, but other than that nothing but the brake indicator light comes up. Im getting full battery power, all guages and fuel pump come on. I replaced the starter, starter solenoid, and starter relay. Still, randomly I have this problem. The battery and alt have been load tested and both are 100%, which leads me to believe this may be a connection or wiring issue somewhere. If it will turn over, it will start right up and have 0 issues driving. I am really unsure where else to look and was hoping someone else had some insight on where to look next?
Thank you for your reply Jerry. I was afraid it may be an ignition switch myself. I have been through and cleaned and reconnected these cable on the battery and starter side several times through this ordeal. I was just curious if there was any way to test an ignition switch, or is it just a replace and see if it fixes it
If the small starter relay inside the power distribution center is energizing when the starter isn't working, the ignition switch is ok. If the small starter relay is not energizing, it's either the ignition switch or the wiring.
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Had this exact same problem on my 98 2.5l. I was able to get it to start by letting it sit and/or playing with the battery cables. One day it finally left me sit and wouldn't start no matter what. I was getting power to the starter relay, the starter seemed to test fine, the battery, cables, etc.. all tested fine. To be sure, I replaced the starter, ignition switch, and starter relay, all to no avail. Different batteries and cleaning the ground connections did nothing as well.
It ended up being my PCM connection; the one connector had come loose somehow. I unplugged the PCM connections, cleaned them, and put them securely back on. Now for the first time in the almost two years I've owned my Jeep, I can walk out and count on it reliably turning over every time I turn the key. This may not be your problem, but if everything else checks out you may want to look into this. It took me a while to find since I wasn't expecting it.
By the way, the PCM connections are the three plugs located right above your battery (they may have a plastic covering over them).
I've definitely been there and know how frustrating it is. I wasted countless hours on that problem just to find out it was a stupid connection problem. Hopefully yours is as cheap to fix but easier to find. Good luck.
This may sound crazy but I have noticed that if I set the parking brake, I start to experience some of these no start problems. Everything has been tested, including the computer and everything is operating correctly. Is it at all possible that somehow the parking brake and not starting are related?