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No start as in you turn the run/start switch and nothing happens? Or merely turns over on cold cylinders without starting before the battery dies?

I had the same issue recently. The wait light stopped coming on and then the next day my batteries were dead. I recharged the batteries and upon reinstallation i could hear the audible clunk of the box when i hooked up the neg terminal. The box was draining the power even with the run/start...

Before you start dumping lots of cash on replacement parts go through the troubleshooting guide in the unit maint TM book 1. It will at least help narrow down where to focus your attention. I'd recommend using a multi-meter and checking that the power gets to where it's supposed to, in my case...

My point of view is if it aint broke, don't fix it. However, the S3 (smart start system) has some perks. In theory will extend the life of the glow plugs by only activating them when required, and eliminates two minutes of V-guage bouncing. Not too sure what other advantages there are.

That pic of the little box on your LH wheel well next to the Cadillac valve is part of the fan/cooling system.

I don't inmagine the TSU's fail all that often. However, the one in your truck will have to be replaced when you choose to replace your current box with an S3.

That's the temperature sensor unit that screws into the water crossover on top of the engine. It senses the coolant temp and tells the box whether or not to activate the glow plugs. The S3 comes with a matching TSU and it's not a good idea to mix brands.