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Hello, unfortunately i am posting on here sooner than i intended. Tonight i picked up a 1988 MJ Pioneer, 4.0, 4X4, Manual, 114K Miles. About 50 miles into my 100 mile trip home, cruising along at 65mph, the engine completely died. There was no sputter or signs of charging system issues prior to the issue. I put the clutch in while still rolling and the engine did not crank, or have any sign of life. My headlights and dash lights did stay on the entire time. On the side of the highway i attempted to start the engine multiple times, but nothing moved, no sounds from the starter, solenoid, or fuel pump. Now for the history. The previous owner replaced the lock cylinder after someone busted the old one trying to steal the vehicle. He replaced it with a cylinder fromm a S-10 which i believe is a proper fitment. My theory is that there is a loose connection at the ignition switch. This would cause the system to act as though the key is not being turned at all. Unfortunately i am not too familiar with Comanches yet. I plan on checking fuses tomorrow night, then working my way through the wiring. I hoping the knowledge base here will help put me on the right path to sorting out this issue. Nothing like a $250 tow bill introduction into Jeep ownership, Haha. :)