No 12V lights

[Bob Stevens]

No 12 volt lighting, bath fan, thermostat  battery is good 12v+.  Have power to ignition

[vito.a]

What model coach do you have?

Most motor homes have two 12v systems.  One runs the chassis/engine.  The other runs the house and through the inverter some of the 120v system.  

Use a volt/ohm meter and test all the batteries, both house and chassis.  

Make sure the salesman switch near the entry is on.  Make sure both battery cutoff switches are on.  

[klcdenver]

Check your DC fuses, usually located in your bedroom closet

[Bob Stevens]

1998 Windsor no slides

no power to the bedroom fuse box

Both batteries good. 
 

salesman switch is good 

Bad solenoid after salesman switch. I wired around it for now

[woodylmiller]

Jump the salesman relay and check.  It was the problem when we had that problem.  A latching relay in the rear run box next to the big boy is where mine is located.  Still have it jumped since we never use the salesman switch and they mounted that relay in a really tough spot to get to.  Good luck.

Woody Miller

09 Dynasty

[Bob Stevens]

Mine was the solenoid. Jumped it. All better now.