Article on The Internet Mini Encyclopædia
A voltmeter is a much more effective, and safer meter than an ammeter. It carries no amperage to speak of.
Readings are approximately as follows:
battery(key on)12.6 v.
cranking 10 v or higher (less may be bad starter),
charging 14 v or higher.
Alternator is great if 14 v is held while all accesories are on. If it drops, maybe a bad diode. (one gone drops output by 2/3)
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