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Which is best, ammeter or voltmeter? |
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Ammeters measure electrical current (in Amperes) flowing through a circuit and therefore are wired in series with the load. They are useful when using a dynamo based charging system, as they can warn the driver for example, of negative charging conditions. However, because ammeters are connected in series with the circuit being measured, it requires that current flow (both positive and negative) passes through the ammeter itself. This means that heavy duty cables are required to connect to the ammeter in order to withstand the large electrical current being passed through it. If using an alternator based electrical system, the electrical current flow tends to be higher than that of a dynamo, and therefore the greater the current flow the larger the cables need to be. Modern alternators tend to be connected to an ignition warning light that illuminates, should the charging current become too low and thus reducing the need to constantly monitor the charging current. However they are a useful, instant method of measuring current drain incurred from various loads (e.g. headlights). Voltmeters measure electrical "pressure" and are connected across a circuit. This means that wiring is very simple and standard automotive wire required for the other gauges can be used. Voltmeters will provide you with the current status of the car battery, as well as indicating charging problems (by a gradual voltage drop indicated on the gauge). In general, if you are concerned about electrical wiring, Speedy Cables would recommend fitting a voltmeter rather than an ammeter. How to connect an Ammeter
How to connect a Voltmeter
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