I had a Jeep Cherokee that did the same exact thing, and would have difficulty starting intermittently. The culprit was the ground line to the motor. It had a loop style connector that should have been connected to the head with a bolt, and instead was just barely connected by sticking the loop over the end of a valve cover stud. Any time the vehicle would shake, the motor would lose power, because the connection was bullsht.
Your problem sounds more like a bad wiring connection than anything else.
I would start by checking the ground strap connection. If that's good, then I would start the motor, open the hood, and start wiggling electrical connectors and wires. Disconnect and inspect any bad connection. Don't be afraid to remove wire wraps to inspect individual wiring in a grouping. Clean the connections and replace any wires with damaged insulation. Rewrap the wire groups with good wraps. Also, make sure the wires are plumbed correctly, in the proper mounting points, and not just dangling free. If they aren't, they could short out against anything they come into contact with.
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Your problem sounds more like a bad wiring connection than anything else.
I would start by checking the ground strap connection. If that's good, then I would start the motor, open the hood, and start wiggling electrical connectors and wires. Disconnect and inspect any bad connection. Don't be afraid to remove wire wraps to inspect individual wiring in a grouping. Clean the connections and replace any wires with damaged insulation. Rewrap the wire groups with good wraps. Also, make sure the wires are plumbed correctly, in the proper mounting points, and not just dangling free. If they aren't, they could short out against anything they come into contact with.
Sent from my SCH-i705 using Tapatalk