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How do i install a dual terminal horn with single terminal wireing set up?

(1990 Ford F-150)
in Schulenburg, TX on February 21, 2012
I have a 1988 Ford F-150 Lariat XLT 5.0 and the old horns are singal terminal and the new horn is a double terminal
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Single wire horns get power and the body of the horn is automatically grounded. It sounds like the horn you have gets one terminal connecting to the power wire that was going to the old horn, the second terminal on the new horn needs to have a ground wire attached to it connecting it to ground/metal on the body.
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