if the horn is already there and is bad, just disconnect the two wires on it, unscrew horn, remove it and reinstall the new one and reconnect the wires. If you don't have a horn, then find a suitable place under the hood and drill X number of holes. The switch is wired in series with the battery and horn. The button is placed at a convenient place you can get to it when you want to blow the horn.
The positive terminal of the battery would be connected to the positive terminal of the ammeter. The load would then be connected between the two negative terminals, positive side of the load being connected to the negative side of the ammeter.
a battery and a resistor connected together.
You would short out the battery. If it was a car battery capable of 300 amps and the wire was big enough, the battery could explode.
The voltmeter would read 12 volts. An ammeter connected to to battery would only read 4 amps (12 volts divided by 3 ohms =4)
it is possible for the unlock side of the switch to be bad and it has nothing to do with the battery
I am not completely sure on why you battery in your Mustang would be smoking only when connected to the starter. I would take into a shop and have them look at it.
nearly 12v when running means your battery is not getting charged.. it should be just shy of 14v when the alternator is working correctly
Related to a battery and open load is the battery just sitting there without anything connected. A short is a very low resistance attached to the tow terminals of the battery. For example, a wire connected across the battery terminals would constitute a short.
That would be a battery.
Overcharging by the alternator or if it is connected in reverse polarity.
Torch equals flashlight. Battery negative connected to case switched to bulbs outside. Positive connected to the lamps bottom. Called a series circuit.
depends on the voltage of the battery being used. USB voltage is 5 volts DC. If you use a car battery, which is generally 12 volts, I would think your device would not like this. But to answer your question. Yes, it will charge. But not properly if you do not use the correct voltage.