2014 e450 V10. After messing around diagnosing a evap purge issue I forgot to replace a fuse which tripped the anti theft. Replaced that and the security icon went away. Now everything functions normally but no crank. I jumped it at the starter relay and fired right up. Checked all fuses and relays I could find. Assuming a wiring issue somewhere under dash but am now stuck. I did disconnect the battery over night and did the key cycle reset but to no avail. Anyone have an idea of what to test from here?

 

First, I'd test if voltage is getting to the load side of the relay terminal. If it is, I'd check for power on the control side when the ignition key is turned to the [start] position.