Okay, just an update here.
Since replacing the FCM, and still having the same problem, the Mopar dealer agreed to allow a return of the item (new FCM) for a refund. Thank God, $220 bucks refunded.
I've been racking my brains on how to further diagnose this problem. By trade I'm a computer repair technician and one method I use when diagnosing a computer hardware problem is by process of elimination: strip the entire computer down to bare minimum parts and begin to rebuild it. So I've applied this same technique to my truck.
I've pulled every non-essential fuse and relay
from my fuse box under the hood. I mean EVERYTHING that I don't need for the truck to run
, I removed. Total of 14 fuses and 3 relays removed. Fuses that I pulled include electric brake, trailer lights, trailer battery, power seat, heated mirror, etc.
I just ran the truck 43 miles in local traffic with lots of stop and go. And guess what? The problem is gone
I didn't touch the fuse for the instrument cluster. It's still there. My dash lights are working because when making a left turn an occasional LAMP OUT light will come (indicates I have a turn signal bulb getting ready to go out).
So, that's it. If the problem returns, it'll be time to call in an exorcist. By the way, do we have of those here on RamForumz? LOL