Refrigerator fans

[Ryan Wright]

Folks,

Last year we had a chat about refrigerator fans, specifically putting
one behind the fridge to blow over the coils. Several members tied
theirs into the "refrigerator fan" switch in the coach. I'd like to do
the same, as my switch doesn't seem to do anything - no fans come on
that I can find. I'm thinking someone removed mine at one point in
time - I know the fridge itself has been replaced.

So my question is, do I need to fish a wire back up to the switch, or
does the wiring already go somewhere - and if so, where might I find
it?

-Ryan
'86 PT-40 8V92