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Look up the UVC (Under Valve Cover) Harness Repairs. It sounds like your harnesses may be fried, causing all kinds of sporadic problems with your injectors and glow plugs. If your glow plug solenoid died it's probably because the harness is shot and was drawing too much amperage, overheating the contacts at the solenoid. If your harnesses are grounding out to each other or the heads, that could cause your GP circuit to stay active longer.
When you first crank the truck you'll only show about 8v because the GPs are pulling some MAJOR amps. When it creeps up to 14v is when you know the circuit has disengaged and no longer pulling that power.
Check your injector harnesses (two pigtails on each head, going into the valve cover gaskets on the valley side of the gaskets) and pull your valve cover to do it properly. It's a few minutes more to inspect it thoroughly, but my old pigtails going into the valve covers looked perfectly fine until it was too late. By the time I pulled the passenger cover to inspect, both plug sections had fried completely and one actually looked like it had incinerated.
FOR SALE: 1994.5 F350 XL, 7.3PSD/ZF5, 4x2, 4.10s, crew cab, dually, gooseneck, brake controller, Diamond Eye 3"/4" with cat delete and new muffler, EBV delete.
2000 F350 XLT, 7.3/ZF6, 4x4, 4.10s, SuperCab, dually, gooseneck, brake controller, Red Head on the way.
1985 4Runner, 22RE/5spd, 5.29s, grooved 38" TSLs, front locker, rear spool, sliders, other stuff.