Quote:
Originally Posted by thompwil
The double throw will allow a circuit path to have a common origin and selectable destination. The sending unit would be connected to the common terminals. The normally closed contacts would go to the interior gauge. The normally open contacts would go to the outside gauge. Energizing the relay with the pump switch would send the signal to the exterior gauge.
EDIT: I think we're saying the same thing, terminology quark. I looked and only found one wire from the gauge hanging loose.
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I admit, I haven't researched the circuit layout but just from running it through my empty head the gauge proper would have positive voltage applied to it and the negative side would come from the resistance loaded float. That's the way it was done in the automotive industry as I remember. If that's the case then only one side of the gauge would need to be switched.
My thinking would be to allow the default gauge to be switched open and then the other gauge to be closed via the relay.
That's a SWAG on my part due to my ignorance of the circuit.
Now, if you could get by with a single throw relay to make the switching work you could then use a transistor for switching purposes since the current to the gauge should be low.
A few options available but since you have your hands on the wires I'll yield to your ideas and wish you a successful smoke test when the time comes.
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