Just wanted to say the Camotek Start Box is a wise investment. I wasn't having any start issues even in cold, glow plugs were fine and it started, however the glow plug light would just flash 18 times. It would not give the indication the glow plugs were firing. Narrowed the problem down to a short caused by either the heavy rain it had just gone through or the cutoff switch shorting the box. If you have a cutoff switch I recommend you get this manual glow plug box it can not be shorted like the original smart start boxes which short on the circuit board.