I got an Edwards Adaptahorn 374 for Christmas. However I don’t know how to remove the back cover or power it on. It has 2 Wires coming out the back. One is Red and the other is White or Black.
There should be a screw underneath the bottom of the horn: remove it & that should allow you to pull the mounting plate off (also make sure to check the voltage on the label & only power it with said voltage (which you might need a transformer for).
I was able to get the plate off (with a bit of force) and I noticed it has an (Outlet Plug?) of some sort. Does this plug into an Outlet?
The Horn says 115VAC and my House’s power is 110VAC.
No: the plug on the back of the horn connects to an “outlet” of sorts on the front of the mounting plate (the latter of which is connected to a power source via two screw terminals).
Yeah, you should be able to use your house’s normal 120VAC electricity to power it (make sure you know what you’re doing though, lest you start a fire or electrocute yourself: this is of utmost importance).
Would I remove the Wires that are screwed into the Terminals then plug in the wires I’m going to use?
Also which Terminal is Hot and which one is Neutral? I don’t want to mix up the two.
No: leave the wires that connect the terminals & “outlet” together & attach external wires from the power source to the terminals via the screws on them.
I don’t think they’re indicated anywhere on the horn, & polarity in this particular case may not matter anyway.
So I leave these Wires connected and use Wire Nuts to connect my Wire Cable?
Also my Wire Cable has a Ground wire on it, what do I do with the ground wire?
Oh, you mean those. No: remove them & hook your power source wires up where they were.
Well, on a device like this there’s usually no dedicated ground connection, but you could try securing it somewhere on the horn’s metal body for added safety.
Yeah, a Garvin GSST into the metal body would do the trick for providing a grounding point if the factory didn’t leave a 10-32 hole tapped for such. You may wish to crimp a #10 ring or spade terminal to the ground wire in your cord though to make sure that the grounding wire stays together, though.