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I don't know about your car, but my B13 horn is positive triggered. Just use a multimeter on the OEM horn hookup wire to check for voltage while the horn button is pressed. Some horns are negative triggered but I don't know if your's is or not. If your horn is negative triggered, then you will hook the OEM horn trigger wire up to 85 on your relay, and 86 will have constant 12V. If your horn is positive triggered, then the trigger wire will go to 86 on your relay, and 85 will be grounded. Yes, 87 or 30 will go to the horn, and the other, be it 87 or 30 will go to positive voltage. If your relay has an 87a tab in the middle, you can break that terminal off, or just do what I usually do, and put an empty fully insulated female quick dosconnect on it, to keep it from ever grounding. You'll have to check it out yourself for your car, but b13's have an OEM horn relay, and if the wiring is up to par for the job, then a person could merely up the fuse size for the horn when installing an aftermarket horn (if it draws more current than the OEM one, which they typically do). If you need any further help drop me an e-mail or PM me.
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Rob '93 SE-R
PM or e-mail me for Progress swaybars $190 shipped, B13 Progress coilovers $1300 shipped and B13 Progress LCA brace $160 shipped.
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