The way the relay is set up and how you wire it in makes the difference. Using the link to the relay contacts I put in the previous post you can see what the difference is. With no power actuating the switching of the relay, that is, no power to Pin 86, main source power comes in to Pin 30 and goes straight out through Pin 87A with nothing going through Pin 87. With the switching of the relay, that is putting power to Pin 86, the relay switches internally and source power comes in, again, to Pin 30, but, goes out through Pin 87 and disconnects Pin 87A. So, in relation to what this thread is about, Lo-beam lites would be connected to Pin 87A and when the dimmer switch is activated, power comes in to Pin 86, which switches the relay to disconnect the Lo-beams, and put power through Pin 87 and operate the Hi-beams.
On Willit? I did a slightly different hook-up with one relay. I needed power only to specific circuits during the start cycle, but needed those circuits plus others while the engine was running. The relay was used to power the start circuit coming out of Pin 30 with power coming in only in the start mode at Pin 86 and making the source power come in at Pin 87 and when I turned off the starter, source power was switched over, coming in to Pin 87A and out through Pin 30.
So basicly, the normaly closed means that, with no power to Pin 86, Pins 30 and 87A are electrically connected and Pin 87 is disconnected from Pin 30. With power to Pin 86, Pins 30 and 87 are electrically connected and Pin 87A is disconnected from Pin 30. Hope this answers your question.


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