Not getting spark

Would not start today. No fire to plugs.(I am sure) I checked all wires and fuse, giggled a few things and it fired right up for about 10 seconds then died. Again no spark. Where do I begin to test? 1996 E175 GLEDB. My kill switch attaches to the key so I don't think I have a separate circuit. Thanks

Sounds like something may have corroded over the winter. Take all connections apart, clean them and check grounds!