Assuming Residential Refer in this comment. First on the passenger side in the access bay for plumbing, tanks, stuff, I believe one door aft of directly under the refer, there is a receptable marked "REFRIGATOR ONLY".
In the breaker panel, turn off breaker REFRIGATOR, that should kill it. Before you do that, you should turn it off inside the unit, the front panel lights will still burn (assuming you have water, ice, that stuff).
Monty & Janet - 2007 Alpine APEX 40 MDTS
S/N - 75715 - Retired - Master Certified RV Tech