Trace SW4024 Charging Relay

Howdy, first time poster here.

So I have a Trace Engineering SW4024 running in my system with no problems. Or at least that is what I thought until I went to check my back up generator.

Power is getting to the inverter but once there the inverter doesn't see it.

I was told by a knowledgable neighbor that the generator relay block may have gone bad. 

I tested the continuity of the +/- inputs on the inverter generator blocks. They indeed were continuous but not sure that means much.

Are these relays replaceable? Is there another way I can verify that this is indeed my problem?

Thanks for any advice!

Jon