Battery disconnect solenoid

Our's is a diesel pusher, the firewall is big box under the bed.
Our's won't click.

On my 1999 it is in a box mounted on the firewall. Open the hood and look to the upper right.

Edit: Just noticed that your MH is the DP not the Gasser. I had an issue with my disconnect switch where I had to hit the switch 3 or 4 times before it would reconnect. Ended up replacing the solenoid. Won't help you find the solenoid, but might get you 12V power for the short term.

For the long term, check out Newgle (link). You register your MH serial and it gives you access to any documentation that Newmar still has for your MH. Bad part is, it takes like 3 days for Newmar to send you your login.

Can't help with your brand, but my disconnect switch is on a side panel near the entry door, and I can hear the solenoid click someplace very close to the switch. I think it's in the box just behind the switch. But now that I see you asking this question, next time I'm at the motorhome I'll listen closer and make sure I know where it is, just in case it goes out.