Long time creeper first time caller. My buddy's 2012 Rubicon (US build) has been having a very intermittent crank - no start for the last month. He's the wheeler, I'm the spotter and wrench, so I come to you fine people. Starter and battery were replaced in the last month on what seemed a separate issue. The crank-no start began and the crankshaft position sensor was replaced after it was towed to a local shop. The problem ceased for about a week but today returned. Drivability and power/response is totally normal when it decides its a good day. Sometime he turns it off and returns to the car a while later and it again cranks but no start.

I've poked around on many other threads here and have a few more things to check. Fuel pump, fuel relay, fuel pressure, connections and install job of the crank sensor, etc etc. But I stumbled upon the WCM issues of earlier models and the J13-pull-push procedure and the car fired right up after that. So the question I figured best answered in this section is Q1 What items are on the J13 IOD MAIN that are always hot and were power cycled when I pulled the fuse? that way I can eliminate certain components that would be a non-factor and focus on what's being a brat.

Also open to suggestions of the issue. Thanks everyone