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Old 06-24-2019, 10:23 AM   #1
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2016 25' Flying Cloud
Huntington , New York
Join Date: Jan 2017
Posts: 349
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Fan Install Dometic RM3762RBX 2016 FC 25FB

Anticipating a series of hot boondocking weeks, wanted to try an idea I heard about here and other RV threads which involves moving air inside our 3-way refrigerator to help keep it cool. The idea is that the temperature gradients get fixed due to the passive nature of air convection inside the refrigerator and by providing a fan to move air during the hottest days, in theory it will keep the unit cooler for the same amount of propane/electric expended.

There are a variety of units you can purchase with fan/light/switch included in the $80 range but they all involve tapping into the electrical circuits on the inside of the refrigerator so if that was going to be the path, might as well save the $80 and do it for about $15.

In case someone else is interested in doing something similar, this is the path I took; YMMV.

1) Remove the door light switch from the left side of the doorjam by gently prying it out. It clips into place and stays there, more or less crookedly, by two pressure clips.
2) There is a single grey wire and a single black wire both connected to the switch by means of a spade female connector. The grey wire goes to the 10w incandescent light on the left side of the refrigerator interior and the black wire provides a 12VDC ground from the refrigerator circuit board. You can confirm the wiring by looking at page #17 of the service manual at this link:
3) I disconnected the black female spade and clipped the wire about 1" behind the spade. Using a butt splice heat shrinkable connector, I joined the black wire with the spade to one leg of a 14-gauge wire from a toggle switch on one end and reconnected to the red lead on the other. In effect, making a tap getting a 12VDC ground from the line side of the door switch and reusing the original female spade connector on the switch.
4) Drilled a hole angled just inside the refrigerator past the rubber door seal connecting the inside cove area where the switch sits. Pulled the 14-gauge wire through that hole where it runs up the left side of the refrigerator interior to where the toggle switch was affixed using double stick tape. Other leg of the toggle switch connected to the black wire of the fan.
5) Opened the 10w light switch and disconnected the red female spade terminal which provides 12VDC positive power. Clipped this 1" short and made a tap using the same butt connector splice as was done in #3 above. This wire runs out from the light switch housing into an inline glass fuse holder holding a 1A fuse. The fuse holder is connected to the red lead on the fan completing the circuit.
6) A 5" L bracket from Home Depot was attached to the fan on the left side and to the shelves below using fender washers. The fan was oriented so the intake faces the silver fins and the outflow faces downward.

When the door is closed (or open) and the toggle switch is activated, the fan draws cool air from the cooling fins and forces it down to the shelf & shelves below helping to circulate the air. The plan is to use the fan when the refrigerator would normally be struggling on a very hot day. Equipment list below was sourced from Amazon. The photos here show all the wires broken apart so it's easy to see but they were enclosed using split loom plastic covering to keep them out of the way.

GDSTIME 120mm x 32mm 12V 3000rpm DC Centrifugal Fan Brushless Cooling Blower Fan #GDT12032S12V2P2.54H
Jianfa Toggle Switch #JIANFA026

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