Re: Ammeter & the Horn Relay
Yes, but aftermarket ammeters are not. The wiring precautions all depends upon the engineered safety placed into the installation.
If he is using an OE ammeter, then yes, the OE gauge is measuring millivolts of voltage drop on a length of wire, a parallel millivoltmeter.
Gauge selection is personal preference. Voltmeters are nice, but a series ammeter on the battery tells me the condition of the battery. A voltmeter measuring the electrical system pressure, won't tell me the internal condition of the battery whether it has a dead cell, shorted cell, or slowly aging as shown by the current being measured.
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