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The old boxes were pretty stupid and did not care about much but the new smart start box may see you have missing/bad glow plugs (not enough current)
RWH should have the answer to that as he has dealt with many smart start issues.
The start circuit goes through the "box"
Use a test light and see is the signal is getting in and out of the box.
Also make sure the connectors are good and tight.
I think I would just live with 7 good glow plugs before getting to the point I had to pull the heads, they only affect the first couple minutes of operation.