Dash lights and rear running lights quit working at the same time

Hello,

There is a tail light relay that needs to be checked. here is guide to help and the location of the relay:

https://www.2carpros.com/articles/how-to-check-an-electrical-relay-and-wiring-control-circuit

Here are the blinker wiring diagrams so you can see how the system works and where to check for power.