The way its needle wiggled back and forth constantly confused people. The reason was so few people understood what the ammeter did. By then however, it had already disappeared on the car, and would soon on motorcycles. On motorcycles, the pushrod Brit iron (and their unreliable electricals) became the classic home for the ammeter into the early 1970s. It was important in earlier days to closely monitor electrical activity because the electrical systems were not as robust as they are today. The ammeter was once widely used in cars and on motorcycles. The History of Ammeter Use in Motor Vehicles The difference between these two instruments is that one (the ammeter) shows electricity on the job and working, while the other (the voltmeter) shows only the afteraffects. A voltmeter on the other hand measures accumulated electrical pressure. If the flow reverses direction, the ammeter indicates that also. The heavier the flow, the higher the ammeter reads. An ammeter indicates the flow of electricity. That is, the pressure of accumulated electricity that has not yet moved.Īmps and volts are measured with electrical meters. Voltage is really just electrical strain, between one place in the circuit and another. This pressure or weight is the result of the different magnetic power between one place and another in the circuit. Another way to look at it is to say it has weight.
Electricity's other important attribute is pressure. This flow is often referred to as current, and it is measured in amperes, or amps for short. Rather like the water flowing from a faucet. That is, the electricity moves, it is not static. The electrical energy coursing though your motorcycle has a couple of important characteristics. The ammeter was reading happily on the charge side, and I could ride the 40 miles home without concern. I fired up the machine again and noted with the kind of detached satisfaction that only a professional motorcycle mechanic could have, that all was well again. A little scraping with a pocket knife (the only tool handy) quickly took care of that. After killing the engine and hopping of the machine, a few minutes' probing found a corroded rectifier connector. I knew that because the ammeter mounted in the top of the headlight shell was reading steady discharge. It was time to go, and I fired up the bike (a CB500 Four) and almost immediately noticed that the charging system wasn't working. I was at a friend's house until late one evening, back in the middle 70s.
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