Wiring New Relays
Basically talkin', you only need three (3) wires in order to get a Relay properly working, to Power a Device (Such like Horn, Halogens, etc...)
1► the Positive input shall be placed in two Spades, the Nº 30 (which is the High Power positive imput, directly from battery - To be Transferred to the Device once the Relay is On) and to the Spade Nº 86 (Positive switchin' signal) and those could have power permanently.
2► The Switching (On / Off) Signal, comes in from the Ground, sent by a Grounded Switch on the Dashboard (or wherever you might want to put the Ground source, such like a High / Low Beams' stick, Horn button, etc...) It goes to Spade Nº 85
3► The Positive Power Output to Power the Device, (Halogens, Horn, etc...) goes out from Spade Nº 87
Of course you could use a Positive signal (+) to switch the Relay on /off instead the Ground, But that's a Four (4) wiring install.
In such case, the Relay's ground shall be Permanently connected to Spade Nº 85, and the Direct Positive imput shall goes to Spade Nº 30 ONLY, then you use a Low power positive as Switching signal on Spade Nº 86. Remember: Nº 87 is always the Power Output for the Device.
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I have a couple of Pictorial Diagrams to Help you in How to Wire New Relays;
you can find one of those in my other writeup, named:
~► "How to Wire Dual Electric Fans on a Subaru EA82"
This is the Picture:
Also I posted another Pictorial Diagram, in my Wife's car Thread: ~► "The KiaStein"
This is the Picture:
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