I am trying to pull the two fuses for the detectors so I can store the van. They are not on the panel on the front of the rear seat. SMB West says they sometime times put them under the rear seat seat but I don't see them.
Mine are under a covered junction box located under the seat. The cover pops off to expose the fuses.
I have the RB50 layout in a 2007 and the fuse box is under the back bench seat just like artictavellers. If you have a different layout the fuse box should be close to your inverter and very close to your battery isolator.
2007 E350 RB50 Sportsmoble, Always longwinded and misspelled.