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How do you wire a circuit to close only when two other circuits are both closed?
Wiki User
∙ 12y ago
You could probably use 2 common relays:
1st relay would be powered up by closing circuit no. 1 using the coil of the relay
2nd relay would be powered by the 1st for the function of the circuit in question
both circuits would have to be closed before the 3rd circuit would close and function
I thought of a much simplier way to solve your problem.
Get a cooling fan relay at
Auto Zone Part no. 19899 $15.99 and wire as follows:
Terminal No. 85 power up when circuit No. 1 is activated (turned on)
Terminal No. 86 Ground
Terminal No. 87 power up when circuit No.2 is activated
Terminal No. 30 Load of circuit No. 3 (the one you want to control)
I think this will work for you
Wiki User
∙ 12y ago
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