Hi Everyone, I am new to this Forum. The Mystery is, This vehicle has done 300.000 KM it has presented a real problem, it has a new starter, new glow plugs , new heavy duty battery, On a cold morning it will not start the click of the relay is heard ,the glow plug light is on and when it turns over it turns very slow like the battery is almost flat. roll it down hill and instant start then turn around ,park and turn off and it will start and run all day perfectly,does anyone know if the relay can appear to operate but not be sending current to the glow plugs and why the starter turns over slowly all on a cold morning, a jump start makes no difference,