Help! Switched coach battery-no power

[tomtom]

I have a 2021 Thor Compass . I removed original 12 volt house battery and replaced it with a larger 12 volt battery. Now no coach power. Very smooth install. No sparks or anything. I thought the new battery was bad so I put the original back in. Still no power. Any ideas. Please advise.

[16ACE27]

Status of battery disconnect?
Did you check the 50 AMP DC breaker?