Quote:
Originally Posted by trace2race
Yes it has 12.5-13V...However it also has 10.25V constant without the alarm set or with it set and not tripped. I pulled the horn and did a ohms test on it. There is 127 ohms between the terminals and no continuity from either terminal to the casing, which tells me there is not a short to the casing. Question is.... Should there be resistance between the terminals and how much.....or should it have continuity between the terminals? I have no idea about horns. I would expect there to be a winding of some kind inside, which should show some kind of resistance if I am correct in my thinking.
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Which terminals did you test. The one's to the alarm horn or the ones to the other end? A short is zero ohms. No resistance. If you tested the other end? It's probably fine. You're measuring the resistance of the wire and the thing that triggers it. A horn is basically a speaker. Another way to test the horn is just put a 9v battery on leads to it. It may be weak sounding. But it should make some sort of sound.
Randy