I've got a 97 f250 that has the p1396. Its not burned into the computer as I've gotten it to go away, but it'll come back. I've replaced all of the wiring under the valve covers, the valve cover gaskets, glow plugs, and the glow plug relay. All of the glow plugs ohm out within spec the last time I checked which was 2000 miles ago. I'm guessing my problem is somewhere after the glow plug relay and before the connectors. Currently the problem has fried the two connectors on the driver's side. What is the best way to go about trouble shooting this problem? I'm almost to the point where I'm just going to disconnect the glow plugs and call it good.