Replace a non power vent with a 12v fan

[TazMcren]

Hi All,
I want to install a Maxxair (4000K) 12V Roof Top Fan/Vent in the bedroom to replace the manual crank vent (no fan) in my 2018 Cougar 310RLS fiver. Since this OE vent has no power I can’t just tap into the existing wires. The bedroom is also Pre-Wired for an air conditioner.

I pulled the beauty trim from the existing bedroom vent to gain access to the wires running in the void. I also opened one of the LED lights to see that it was pigtailed connected to a Green/White wire. I did the same thing to the bathroom vent/fan to see how the fan was wired. It too was pigtailed connected to a Green/White coded wire.

According to Keystone’s color coded wiring guide the Green/White wire is for 12 VDC interior lights.

Is it safe to assume that the green wire would be the 12VDC hot all the time wire? Is there a way to check to see if the green wire is always hot?

Any insight would be appreciated.

Thanks in advance...

[chuckster57]

You could use a test light that pierces the wire with the tracer. Turn off all the lights and if the test light lights, you found constant power.

[TazMcren]

Thanks Chuckster, used my multi meter to test and there is power when the light switch is off. Just waiting for the fan to arrive then it's install time!