On backside of fridge is power module (lower left corner) On the right side is a vertical strip of connectors. At very bottom is where the 120VAC cord plugs in.
At top is where 12V DC leads plug in.....J3 (-) and J4 (+).
DO you have 12V DC power at those terminals?
If NO........DC power is not getting to fridge from DC Dist Panel. Bad fuse, bad fuse clip, bad/shorted wiring
IF YES......then you need to check the 3A glass fuse.
It is top fuse on circuit board under the power module cover.
GO to pg. 13 and follow testing procedures to find out why no DC.
Several tests......all easy