I am a new member and just had an issue pop up. Jeep wont start I turn the key and does nothing all lights come on radio and windows work turn ignition off and back to start and sometimes it starts and other times it doesn't and it takes many turns of the switch before it will start. I have replaced the ignition switch- I put a brand new Mopar starter in July of 2018 when I installed the new motor. The jeep has 15-20 thousands miles since new motor. It doesn't matter if its a short trip or a long trip it will do it occasionally but I want it fixed. I hate to be out on a trail ride and it quits all together. I have read on the internet that there is a yellow wire to the starter that needs the terminal blade replaced because of corrosion and loose fitting. I have also read it needs to be re flashed. Has anybody had this happen and what was the fix. I not sure how to get to yellow wire easily on a hemi motor because things are tight if you have done this please explain how you did this fix this problem.
Are you receiving any DTC's in the EVIC?
If not, my first advice to you would be to hook up an OBD-II scanner and see if you have any stored DTC's that may give you some insight as to what's going on.
As far as the yellow wire going to the starter, you only need to check and see if there is corrosion on the connection where it connects to the starter - if there is, disconnect your battery and then disconnect the yellow wire from the starter and thoroughly clean it with a wire brush until there is no sign of corrosion. Then reconnect it and reconnect your battery and see what happens.
You could also have a bad or intermittent, frayed or broken ground wire somewhere. I would check all of your ground wires going to the chassis and make sure they are all clean and have good metal to metal contact.
Also you said you have replaced the ignition switch & the starter, you might consider having your battery & alternator checked out if the other items I mentioned, don't turn up anything.
There is also a fuse for the ignition switch in the junction block; I'd check that fuse, make sure it's clean and making good contact;