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OP is already trying to sort out what's going on. Ambiguous/contradictive/retorical comments aren't all that helpful when things are in a state of confusion already.

You posed " Why do you think the GP relay had 23 volts run through it? "

It's doubtful that the resistor would ever fail in this circuit. It's just half of the voltage divider. The glow plugs are the other half and that half is divided into 8, which is what causes the cascade failure. Honestly one dead plug isn't likely to have much effect. Two, probably not much...

Because the glow plug system in the CUCV runs off the 24v side, it goes through the resistor bank on the firewall as I mentioned earlier to step down to 12v through a voltage dividing circuit.

If the glow plugs are showing no resistance and an open, then unfortunately they're burnt up. The CUCV uses a resistor on the firewall that works as a voltage divider circuit. The problem is the fact the glow plugs are 12v. When a glow plug fails, that means the restive value of the rest of...