I already posted this in the diesel forum but since this forum has higher traffic volume, I'm hoping someone here can help me out. In the '83, when I turn the ignition switch, the glow plugs light will not come on, no click, and it's not allowing the truck to start. Don't know if this matters, but yesterday after the truck started and ran fine, the light would come back on. Any ideas? I'm new to diesel and am clueless.