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Since my wait light blinks it must work correct? I would think all connections to it would be good?

I've read that the EESS doesn't need the TSU to start. My car does start but the glow plugs and wait light don't work properly. Could this be TSU failure? Should I buy a new TSU first since there cheap and go from there? Or would it be better to get a S3 box with TSU? This would be a more...

So I've read through many of the threads on here regarding this issue and here's where I'm at. Problem: Wait to start light blinks. I also suspect glow plugs aren't functioning properly at least intermittently. New vehicle has started instantly so far except for one cold occasion which took...