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How do you use a single terminal car horn on a two terminal electrical wiring system?
Wiki User
∙ 15y ago
On a vehicle, the return path to the battery is through the vehicle's framework. The negative terminal of the battery is connected to the frame of the vehicle. The reason there is only one terminal on the horn is that, that is all that is needed to make the horn operate. Applying the positive side of the battery to the single terminal which is connected to the horn's coil will make it operate. When the horn is bolted to the vehicle this completes the circuit back to the negative terminal of the battery. Apply the 12VDC to the horn by pressing on the horn button which closes the circuit and the horn activates. A horn with only one terminal has its coil grounded internally within the horn. A horn with two terminals has the coil isolated from the ground. On a two terminal horn there needs to be a wire installed to the frame on one of the terminals to make the horn operate.
Wiki User
∙ 15y ago
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