I have a GST 3300 I have replaced the glow plug relay already. Some times the glow plug lights and the glow plugs work and some times they don't. Then while I am using the tractor the glow plug light will light and stay on the go off. Does any one know if this could be a ground problem or is there some thing else I should check for. The dealer doesn't want to give any information out. This is not the old style but this is the light on the dash when the key is turned to the on position.