Box-shaped fuses/relays in the fuse box under the hood testing procedure

Take a look at these guides on how to test a relay and fuse. If this does not cover what you are looking at, send a picture of the specific ones you are talking about and we will come up with a way to check them out. Thanks

https://www.2carpros.com/articles/how-to-check-a-car-fuse

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