We have an old Oliver OC-46 tracked loader and the starter is driving me nuts. First the solinoid went so we replaced that. Still didn't start. We have tried many different solinoids with 3 different starters. Because this dozer is 40 years old it is hard to get parts for. What Iam getting at is I need to find a way how to check the starter to see if it works. Do parts stores check starters? This is a six volt starter that we run 12volt through using a positive ground. It has worked this way for years. The solonoid is 12volt.