This is gonna be long. For those that do NOT tow their CRV behind a motorhome, you can disregard this post.
Just (2/27/14) took my 2012 EX-L CRV (w/AWD and Nav) to Coggin Honda/JAX for oil change, Xmsn Fld/Fltr chng, AWD Diff oil chng, etc. Have 16.500 mi. Also have a Hotwire (Charging Wire) from the MH to the CRV Batt, but it never charged the CRV batt, 'cuz the CRV Nav and MID CRTs were drawing down faster than the MH was charging. I had to stop after 3 to 5 hours and run the CRV engine to charge up the battery, which discharged to about 11 Volts, or below. I learned the hard way. Initially towed the CRV too long and the Batt went dead twice. Eventually bought a new Batt, after having the flash mod (SB 12-041) done to the Alternator.
A savvy Master Tech at Coggin Honda went thru the elec diagram, and said Fuze 29 (Fuze Box UNDER THE HOOD) needs to be pulled. Fuze 29 (10A) disables the Nav and MID displays, yet leaves the two DC Outlets (for my Brake Buddy) operable. The fuze also makes the elec door lock inop, so you have to manually lock the doors. The Steering Wheel still unlocks, as well as the Lights work (DRLs, Turn Signals, etc.). I say again, this is for my 2012 EX-L CRV AWD (w/Nav & MID). OTHER YEAR MODELS AND VINs MAY DIFFER. But it's a hell of lot easier pulling Fuze 29 Under the Hood, than thrashing around upside down in front of the drivers seat, trying to pull Fuze 19 in the Interior Fuze Box. I did that Twice, only to find out that Fuze 19 disables both DC Outlets, which I need for my Brake Buddy. And Fuze 19 does NOT disable the MID; only the Nav Display.
The Fuze Box UNDER THE HOOD is labeled with fuze nrs. The labeling of Fuzes 29 (10A) and 28 (7.5A) has a square white border around the fuzes, and is marked "Backup". If you're standing in front of the car, Fuze 29 is the first fuze on the bottom. In other words, it's the most forward fuze to the front of the car. Fuze 28 disables some lights, but I didn't mess with that.
G'Luck, Will Snell