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jvincent · 11-13-2015, 02:05 PM

Caveat, I'm an EE but my field is semiconductors and it's been a loooooooooong time since I had to look at relays.

You polar terminology confused me. Normally relays are referred to as NC (normally closed) or NO (normally open). As drawn, the stock setup is normally open and when you energize the relay it closes.

I think the simplest solution would be add the new horn using the same type of circuit as the stock one. Then just have your selector switch choose to energize one or the other relays.

EDIT: I'm assuming here that the 12V supply you connect can sufficiently feed the new horn.

11-13-2015, 02:05 PM	#5
jvincent Senior Member Join Date: Sep 2013 Drives: 2022 WRB BRZ Sport-Tech Location: Ottawa, Canada Posts: 1,746 Thanks: 131 Thanked 1,411 Times in 715 Posts Mentioned: 25 Post(s) Tagged: 2 Thread(s)	Caveat, I'm an EE but my field is semiconductors and it's been a loooooooooong time since I had to look at relays. You polar terminology confused me. Normally relays are referred to as NC (normally closed) or NO (normally open). As drawn, the stock setup is normally open and when you energize the relay it closes. I think the simplest solution would be add the new horn using the same type of circuit as the stock one. Then just have your selector switch choose to energize one or the other relays. EDIT: I'm assuming here that the 12V supply you connect can sufficiently feed the new horn. Last edited by jvincent; 11-13-2015 at 02:16 PM.