OK, so the rig is an 84 Chevy CUCV diesel. I just bought it about 3 mos ago. I drove it home and it ran good. I shut it off and tried to restart it. It was flat. I purchased some batteries with a higher cold cranking amperage and put them in. It started right up. Then I went to change the old belts and turned the key. The glow plugs and dash light all come on like they should but when you turn the key to start it, nothing. I thought it might be a safety switch so I moved the shift lever around and even put it in neutral. That wasn't it. Does anyone know what this might be or what I should check next? Is there a way to get juice to the starter manually? It looks pretty tight down there. Any help is appreciated.