I just completed the inside Fridge Fan mod.
3 Pin Fan Extension Cable
120mm Computer Fan
$14 (Probably overkill)
12v LED switch from Radio shack for $4.50 (I like radio shack's switches over what I saw on amazon as they mount easily with a 1/2" hole drilled)
When i started preparing for this mod I had planned on using the light inside the fridge that I have read about others doing. Well out units dont have lights (its a new camper to me so i haven't had the chance to notice too much about the fridge) So my next plan was to run the wires through the drain plug, which again we do not have in our fridge (strike 2). So finally I decided that I would run the wires through the small hole that the thermosensor is run through.
To do this I took electrical tape and taped the wires to a wooden cooking skewer and attempted to fish the wires through the existing hole. This however did not work out exactly as planned. In the process the skewer made its own exit hole on the outside of the insulation. I dont see any major issue with this and at least I now i had the wires out of the fridge and somewhere where I could get power from.
As you can see, the red and black wires that are taped to the insulation run up behind the fins in the picture just a few inches above where the thermosensor comes out. But I dont think it should cause any issues.
Now I ran a pair of wires (Red and White in the above photo) along the bottom of the fridge access panel (there was a perfect sized gap between the hot and cold water pipes running along the bottom. into the compartment under the table bench that contains all the power and water heater.
Once there I tapped into the 12v line to one of the lights and added a small rocker switch from radioshack
I then zip tied the lower screw holes in the fan to the shelf and it is firmly held in place with just the 2 zip ties.
Overall I am sure the 120mm fan is a bit overkill but i figured the higher CFM and lower speed would help when the fridge is full. I also decided to use the fan extension cable so that if the fan ever needs replacing it is plug and play.
I forgot to snap pictures of where i tapped into the 12v line before closing up the camper. If anyone needs any I can get them next weekend when i am out with it.