12v Power Access in 192RBS

[Last_Train]

Our 2016 Coachmen Freedom Express 192RBS has an OEM supplied roof vent over our bed. Nice for static ventilation, but we would like to add a 12v powered fan in this cavity for dynamic air flow. Setting aside the discussion of various fan options that are out there, I'm interested in knowing the best solution to supplying 12v power to this area.

My initial examination might lead toward tapping in to the 12v power to the TV booster switch found in the entertainment system cabinet area. But I do not know if the cavity behind the booster switch leads to an opening in the ceiling above - from where I could perhaps fish a line over from the ceiling vent.

Like to do this before we head out for another trip next weekend . . .

I'd appreciate your informed thoughts!

[Last_Train]

SoundGuy wrote:
If Coachmen didn't already provide +/- 12 vdc at the vent location (I can't say because my 2014 version 192RBS doesn't have a vent as does yours) then just pull it from the adjacent ceiling light.

Correct, no power is provided at the vent by Coachmen. My thoughts as well, about the power source being from a nearby ceiling light fixture. But in doing so, I wondered if we would need to toggle the main light switch for all the main ceiling lights in order to provide power to the prospective fan. True, or not?

Seems like I read somewhere in another forum last year that someone had tapped that TV booster switch power source for a similar purpose as mine. Just can't find the reference anywhere . . .

[SoundGuy]

If Coachmen didn't already provide +/- 12 vdc at the vent location (I can't say because my 2014 version 192RBS doesn't have a vent as does yours) then just pull it from the adjacent ceiling light.

[Mandalay_Parr]

Be careful taping into a switch. Quite likely only the positive side there and no ground.