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After reading so many posts about the horn relay wiring, including wiring to the corresponding contacts identified on the newer "replacement" relays, I thought I'd try summarizing things. I am hoping this is helpful, at least for the Triumph TR4A, and I'll be sure to edit and correct anything you folks might note as being wrong:
1) W1 and W2, the coil contacts, are numbered 85 and 86, respectively, on the newer relays.
2) C1 and C2 are the switch contacts, and numbered 87 and 30, respectively, on the newer relays;
3) W1, or 85, goes to ground. That's the thinner purple/black wire at the relay;
4) The fused main 12 volt power, the solid purple colored wire, usually with a shielded spade connector, goes to contact 30 (C2)
5) W2 and C2, which are 86 and 30, get jumped, at least on most of the more modern relays. Jumping is made easier by using a female spade connector on post 30 that splits to two male connectors. The end result will be two wires on contact 30, one being the power line from the fused purple wire, and the other being the jumped line going from 30 to contact 86 (which is W-2);
6) That leaves only contact 87. The dual colored wire at the relay, usually purple/yellow, is the switched power, and that wire goes to post 87.
I think that's it. Let me know if corrections are needed. thx
1) W1 and W2, the coil contacts, are numbered 85 and 86, respectively, on the newer relays.
2) C1 and C2 are the switch contacts, and numbered 87 and 30, respectively, on the newer relays;
3) W1, or 85, goes to ground. That's the thinner purple/black wire at the relay;
4) The fused main 12 volt power, the solid purple colored wire, usually with a shielded spade connector, goes to contact 30 (C2)
5) W2 and C2, which are 86 and 30, get jumped, at least on most of the more modern relays. Jumping is made easier by using a female spade connector on post 30 that splits to two male connectors. The end result will be two wires on contact 30, one being the power line from the fused purple wire, and the other being the jumped line going from 30 to contact 86 (which is W-2);
6) That leaves only contact 87. The dual colored wire at the relay, usually purple/yellow, is the switched power, and that wire goes to post 87.
I think that's it. Let me know if corrections are needed. thx
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