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Yup. That's what he's getting at. Too big of a risk of junk knock-offs on those, so buy from a reliable retailer like Kascar (as you linked), HummerPartsGuy, MacMotors, or Eastern Surplus.

I'm reinforcing my thought that it's your TSU, or possibly the wiring harness to the TSU. I had been doing some work on my HMMWV and had the connector to the TSU disconnected. For giggles, I put the start lever to run with it like that and sure enough, I had a flashing wait light that lasted...

Can we get a picture of the box you just installed? Perhaps of the temperature sender as well? A topic in G503 with a similar issue seemed to be because the the "TSU" for the S3 didn't match therefor it flashed, never warmed the glow plugs, and the engine was unable to start.

Who's the refurbisher? As well, are you cranking, but just not getting the engine to catch? If you are cranking and not catching, can you smell diesel fuel at the exhaust immediately after cranking?