House battery electrical side not working

[butch]

2019 Sea Pro 208:  House battery electrical side not working after replacing the start battery.  Any suggestions on trouble shooting this problem?  I’ve already confirmed power is reaching the battery switch and the battery switch is good.  But all accessories on the house battery don’t work.  

[fraydknot]

Usually they have a distribution board/fused link in between to protect circuits. Chase it in reverser from a system that is tied to the house battery back to the house battery ..
Also verify the grounds ..