2004 International 4200 VT 365 Check Electrical system no start

I have a International 4200 that will not crank over with key. It just started and ran. Now it only energizes he starter relay and does not crank. It is not the starter because I can hot wire it and it will crank. All wiring looks good. On dash there is Check electrical system light on. I put new batteries in and all connections look good.

2004 International 4200 VT 365 Check Electrical system no start