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Nope. Let's go back to the basics. Every relay needs two things to operate its trigger - 12v and ground. If you have both of them, the relay closes and power flows to whatever device is attached. Of course, we want a switch to control when that happens. Sometimes we give it a constant...

12v from the bus bar to the relay (pin 30), then one switched 12v lead from the relay (pin 87) to the new horn. The horn is probably grounded through the mounting bolt - see the instructions on that. The relay (pin 85) needs to be grounded. Your old horn power lead connects to pin 86. :tank:

She's right. :mrgreen: Might find something useful here: http://www.northerntool.com/shop/tools/NTESearch?storeId=6970&ipp=24&Ntt=air%2Bhorn I see some things there that make me drool.... :D I once installed a car phone (back in the days when they were car phones) for a contractor...

Well, there are two ways to go about it. Either approach requires that you run a heavy wire from a good power source (12v buss bar or battery terminal) to a relay. The factory recommended method uses only one relay and your existing horn switch to trigger the relay. This is probably the...

Here ya go! http://www.northerntool.com/shop/tools/product_200326940_200326940 I recommend using a relay, as this may draw more amps than your stock wiring can handle safely. Just use the existing horn power wire to trip the relay, and you're good to go! :beer: