Quote:
Originally Posted by Bill
I'm pretty enthusiastic about this 3-way switch solution.
If you put two switches in series, the inside switch must be ON before the outside switch will do anything. If you forget to turn on the inside switch, you are out of luck.
And if you put two switches in parallel, the inside switch must be OFF if the outside switch is to have any function. Again, if you forget to pre-set the inside switch ...
But just like the three-way light switches in your house, a three-way hookup of two fan switches, one inside and one outside, lets you turn the fan on or off, from inside or outside, without regard to the position of the other switch.
Thanks, Tentcamper.
Bill
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I have one switch in a waterproof box that is both on/off for the fridge DC circuit, and on/off for the fan. The difference is that I have the fan set up in parallel so that both this outside switch and the inside fan switch can turn the fan on, and the inside switch ON will keep the fan running regardless of the outside switch.
Why would I do this? So that if we stop on the road, I can turn off the DC circuit to maintain the battery, but still have the fan running -- there will still be residual heat in the compartment for quite some time and I wanted the fan to keep operating. But, if I forget to turn on the inside fan switch prior to closing down, flipping the outside switch will guarantee the fan is running any time the DC circuit is running.
It also means I can have all the power off to the TM, and then turn the fan/fridge on from the outside to cool down, but there are many ways to skin that particular cat as well (battery cut-off switch is another, which I also have installed).