I have an Oliver 1650 gas and I am having a hard time troubleshooting an electrical problem. I first thought it was a solenoid issue but now I am not so sure since I purchased a new solenoid and the problem persists. Basically when I turn the ignition switch, I get nothing. On my solenoid there are 4 posts. There is the main battery terminal with the battery lead and a red wire that goes to the amp gauge. Next is a smaller terminal that has a pink wire that goes to the center starter post on the key switch. There is another smaller post that has a white wire that goes to the coil and it also has a black resistance wire that goes to the IGN terminal on the key switch. Finally the forth terminal connects straight to the start post. I found that if I take a extra wire and connect it to the solenoid post that goes to the coil and ground it to the tractor frame then the engine will crank over when I turn the key but it appears I get no spark. I assume this is because I am grounding it so the coil is no longer getting juice. I do not know if I have a short somewhere or I am missing a ground someplace. Any ideas to help trouble shoot this would be greatly appreciated.