Ignition coil fuse keeps blowing

Hello, My Rodeo, keeps blowing the ignition coil fuse inside by the driver. How can you tell if/where a short in an ignition coil is? There has to be a reason for the fuse to keep blowing. Once the fuse blows, the starter will turn over fine, but there is no ignition. Sometimes it won't turn over and will just click, like alternator problems, but we can't find any problems with it. As soon as you replace fuse it turns over and starts.