OP… your fridge is the Dometic 2652 series…
Link to service manual….
http://techsupport.pdxrvwholesale.co...ual-RM2652.pdf
First thing to check after your verify 120 volts AC at fridge plug in receptacle is check the 5 amp glass fuse as indicated in pic .. yellow arrow points to it
Use the TS tree in the manual I’ve given you a link to and you should be able to resolve your problem.
Also read the section that tells you how fridge works on LP mode, Elect,mode and Auto mode.