94pt 'cool o matic' gally exhaust fan

[Pete Masterson]

Greg,

More good info... I thought I saw an orange/black wire going to the
fan motor -- that explains where it comes from. I'll have to spend
more time studying the overhead fuse panel -- I don't have a
schematic of that one, so it's been a little hard to see what is what...

Pete Masterson
'95 Blue Bird Wanderlodge WBDA 42
aeonix1@...
On the road near Scranton, PA (heading to Lancaster, PA, soon)...



On Oct 1, 2008, at 11:34 AM, Gregory OConnor wrote:

> The thermostat output wires probably doesnt even power the fan.
> most likely it powers a bosch relay.
>
> there is a fuse for the thermostat power (above driver sk10) this
> power wire to the thermostat is green
> and a fuse for the fan relay power (above driver sk10) power wire
> is orange/black.
> The fan relay switch (K8, a bosh relay above driver) gets a 12v
> signal from the thermostat fixture to send another source of 12v
> power power(sk10) to the fan
> The thermostat sends a signal back to the relay above the
> driver. that signal causes the relay to make contact and connects
> the sk10 fuse to the fan. the potentiometer at the fan then
> dictates the speed. for the fan to work both fuses the relay and
> the potentiometer must check out ok.
>
> you can test the fan inplace by hooking it up to a portable
> carbattery jump pack. if it runs it still may not be good, could
> be drawing too much amps and the reason some issue of power faulted
> in one of the fuese, relays or potentiometer.
>
> an ampmeter between the battery and the power should prove draw ( I
> dont know how to measure amp draw). My fan has a lable that says 8 .
> 5 amp full speed.
>
> since the fan is not powered directly by the thermostat I can not
> relocate the potentiometer to the thermostat wall.
>
> Greg94ptCa
>
>