2020 400 Mystery Electric Detective NeededGFI/USB Outlets/AMS Switch power issue

Caschetta

Searched but couldn't find a thread for this.

Problem:
1. GFI, AMS switch, USB/lighter in front of trailer under doorside bench has no power to it. No reset possible with no power.
2. Bathroom GFI also has no power
3. Kitchen GFI working 
4. As a result of front AMS switch not working, sleeping area USB outlet not working.

EVERYTHING else in the trailer has power.

Any ideas? All fuses good. Followed the wire from front bench GFI to Bathroom GFI with voltage tester....no power detected.

Is it simply a bad GFI? I'm no electrician but that doesn't make sense. Does a bad GFI not draw power? 

Any suggestions welcome. Thanks!

Raydar

Turn on the inverter switch, and the outlets will work. We have the same camper.

Raydar

The bathroom, bed cubby hole, and the outlet by the door side bench seat. These are powered by the inverter, which is by the bench seat outlet. 

Caschetta

The inverter switch doesn't work either. I mis-typed and referred to the inverter switch by it's name AIMS. (I typed AMS). Yes, we know that powers all of those but it too is not functioning. 

Raydar

Under the center part of the bed is the inverter and a big fuse. Check it out for possible blown fuse. Check for loose connections. 

Caschetta

Ah hah! Thanks. I'll check that next.

Denny16

If your TaB400 is a 2020 or newer, you will need to remove the top cover on the center rear compartment under the bunk, the battery and inverter are bathing the center storage area, as shown below:

The fuse is next to the blue inverter circled in red.  It has a plastic cover over it which lifts up and off.
 Cheers 

Caschetta

Thanks Denny and Raydar for the info. It was the inverter. Fuse not blown but invertershut off. Our battery is the original and not in great condition. It was drained and shut off. Now on shore power and charged as we're preparing for our first trip in a while, the inverter is reset and powering those outlets. Still learning stuff. Lithium battery is the next purchase.