ahh ok i've been having on going boost problems and i think this could be playing a part in it, i took a voltage reading and was only seeing about 9.59 volts , also when i took the hose of the accuator the turbo would only boost to a bar( the tubby has been rebuilt by turbo dynamics about 8 mths ago and hasn't done a great deal of miles i've had the tubby off to check that the waste gate is seating ok and it was, done leak off tests evrything ok , done ecu fault code checks etc ,so now i'm hoping that once this is re earthed i'm hoping this will finally be the end of this boost issue!!)cheers for the input by the way...