Before the use of complex electronic components in cars, the electrical circuits of a car were fairly simple systems. These circuits were powered by a battery. The connection scheme was quite simple: toggle switch (button) - relay - actuator. In order to find a malfunction in such a circuit, an auto electrician did not need to have special equipment, it was enough to have a test lamp, an ammeter and a voltmeter to track the power supply of individual nodes. In the event of a malfunction, the failed node was replaced with a new one. https://starlightautomotive.com/
ronald
Before the use of complex electronic components in cars, the electrical circuits of a car were fairly simple systems. These circuits were powered by a battery. The connection scheme was quite simple: toggle switch (button) - relay - actuator. In order to find a malfunction in such a circuit, an auto electrician did not need to have special equipment, it was enough to have a test lamp, an ammeter and a voltmeter to track the power supply of individual nodes. In the event of a malfunction, the failed node was replaced with a new one. https://starlightautomotive.com/