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Before you wash the engine, did your truck have a fording valve? (high exhaust and intake) if so have you addressed the missing CDR valve?

I read in another thread the low voltage code was 4 flashes, post #19 did not state the number of flashes, again only what I have read.

https://www.steelsoldiers.com/threads/wait-light-flashing.168672/

I am not familiar with the "smart" boxes, does sound like a "code" hopefully someone with more experience with them will chime in. But you can check all the glow plugs, no need to remove them, any that do not ohm out very low ohms is kaput! You should also check and clean all the grounding...

Allot of folks know how the boxes work, where did you get that idea??? EDIT, I have repaired them, many others have repaired them while others have discovered ways of converting them to manual control and even posted the information, no big mystery there.

There are troubleshooting guides, not sure what the US pat. info is going to do for you. You test the glow plugs with an ohm meter not a test light.