120v bed outlet not working.

The Inverter fuse is missing on this SR model. So you may remove the battery negative terminal, wait a few minutes. Then carefully remove the 80A fuse to test it with the DMM.

 

So I hear a click when I push the button so that should mean relay is good

 

Relay fused juice (coil side) is handled by:

 

That’s the issue. Some rodent chewed the wire.

 

You could re-do the harness (wires) from the bed connection to frame side connector.
https://www.corsa-technic.com/item.php?item_id=435
https://www.corsa-technic.com/item.php?item_id=1061
https://www.corsa-technic.com/item.php?item_id=820

or butt crimp and heat shrink it.

 

Even better is adhesive lined heat shrink butt connectors and adhesive lined heat shrink over that. Doesn't look like op is in the salt belt, but still

 

I don't cater to solder on A/C voltage, even if it's only 3A.