Re: Diferent names for one same part.
I fail to see where the words horn, beeper, buzzer, and alarm should cause a problem for you. They are all audible devices and are simply sound making devices to tell you that the engine has a problem. If you are finding all those terms on E-bay, remember that you are dealing with people like yourself who are simply trying to sell stuff they have on hand and in many cases they don't know the proper term either. Put yourself in the shoes of the parts guy who is trying to help you. You ask for a part -- he checks the parts book and finds two, three, or four parts that may meet your description. If you cannot define what you need that's not his fault. He is not a mind reader. Next, each manufacturer can call a part anything they like. It is up to you, the dealers, their mechanics and parts people to learn what the terminology is. As for the words sender and switch they are two different devices. If you have a temperature gauge, your engine has a temperature sender which is a variable resistance electrical device. A temperature switch is a device just like a light switch. It turns on the buzzer/alarm/horn/beeper. Gee whiz, people call a light bulb a bulb or a lamp when a florist would refer to a bulb (a plant) in a totally different context. This is why a service manual that is specific to your engine is of such importance. Yes - you have a manual but is it the "factory" service manual. As for someone doing something about it, what would you suggest someone do and where would you start? The real solution for you is to become educated on whatever it is you intend to service, or let somone else do it. When you see the terms buzzer, beeper, audible alarm and alarm, which of those four do you really think are the proper terms. If you picked the last two you would be correct. That does not make the first two wrong. They are simply terms that have popped up by uninformed people over the years much like the proverbial "pisser" which is about as non-technical as you can get for and "overboard indicator" or "telltale".
Now to your problem. A constant beep/buzz/tone/horn (you pick the term) typically means the engine is overheating. If it does this when the engine is off and stone cold, either the temperature SWITCH is stuck closed in which all you need to do is disconnect it to see if the noise stops. If not, the temperature switch is ok and you move on to the buzzer/horn/beeper itself. You might also check the tan wire to make sure it is not grounded as that's what sets off the beeper/buzzer/horn. Since we have no idea what motor you are working on that's about as far as we can go.
