I have bought 2 brand new Glow Starts that are made by Flight Leader. I have charged them both for 19 hours (the recommended time) and they are still stone could were they are ment to be "white" hot. However, the red light on the transformer comes on while charging. Also when I put them on to my engine (a SC25A) the indicator on the top of it indicates green showing that everything is OK and it is fully charged. I have also tried them both on 2 glow plugs (IC). Is it possible to have to faulty glow starts? Please tell me what is wrong. John.