I got some aftermarket horns off a Volvo at a junkyard. They have only one terminal on each horn. What is the correct way to wiring this type of horn. Do they need a relay. I tested them without any relay in place, just the horns themselves wired like they were on the donor car. They would work at first, then intermittently, then not at all. My wife was holding the horn button down while I fiddled around with the horn wiring to see if I could find a loose connection. She says she saw a wisp of smoke come up out of the dash. I didn't see it and could not smell anything. I'm hoping she just thought it would be a quick way to end the work session. I sure hope she didn't see smoke. No fuse blew. Anyway, I need help. I didn't even check the donor car for a relay. What's the deal with these single-terminal horns? Could I have damaged some wiring by wiring them without a relay and trying to test them by having my wife hold down the horn button?? Is this odorless smoke she saw just 'smoke and mirrors" to get back in the warm house from the cold garage?
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Thanks to everyone for the help, Doug C. 81 242 Brick Off Blocks, stock, M46; 86 244, 140k , auto.