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Does the truck still set the light after you shut it down and start it again?
In order to read the codes you need a OBDII scanner, most say the auto parts store ones don't work real good on our trucks. That is assuming you have a 96 or 97.
I have had the glow plug light stay on before on my 02 but it never set off the CEL...If you know someone with a Superchip,Hypertech programmer or AE they can read the code and clear it for you.I am surprised it has not gone out after that mileage.It must have set a hard code.
Many on here have a Auto Entegrity system that you load on your laptop.It will read all kinds of things on your truck.Clay(Riffraff) sells them.I do not know what they go for now.Surely there is a member near you that has a programmer or AE that will read the code and clear it for you.You may need to start a new thread asking the California crew if anyone is close.