88 Jeep Cherokee, So I'm trying to attach a video of what the truck is doing , hope it loads, Truck will run with the key all the way to the starter position but when you let off it dies, have replaced ignition switch, coil, starter relay. Help!!

Do you have the white ceramic Fuel Pump Ballast Resistor on the drivers fender? I think for 88s it was added mid-year and often installed by the dealer as a recall item to address noise and vibration. The fuel pump gets full voltage when cranking. With the key in run position, this resistor is in series with the fuel pump to drop the voltage. If the contacts are corroded or the resistor cracked, you'll get your symptoms. You can eliminate the resistor by connecting the two wires together with the only side effect being a bit more fuel pump noise. .

See the picture at http://cruiser54.com/?p=35 Then start going through his other wonderful tips for our older "Renix" Jeeps, in particular improving the ground connections.



NM - Just saw your other thread, where you said you jumpered across the resistor. Have you watched the voltage at the resistor to see if the pump is still getting voltage though?