The voltage regulator will adjust alternator output to maintain 14.2 volts at the battery under normal operating conditions. Therefore, most electrical system parts, lights, ignition, and accessories are designed for best performance when operating at about 14 volts.
To deliver power to various parts of the electrical system, some of the wires will be long in length. Most often, the dash area with switches and fuse box is far from the alternator. And under the hood, the battery may be at the opposite side from alternator mounting, which will also require a long wire. Long lengths of wire will result in a voltage drop.
1957 Chevrolet 4 Door Hard Top and 1957 Chevrolet 4 Door Sedan
The key to good performance is to let the voltage regulator make adjustments to the voltage level sensed at the battery. Then other parts of the system will follow the voltage level maintained at the Battery. This is Remote Voltage Sensing. See diagram below of a typical 3 wire alternator with Remote Voltage Sensing! Tip: Never remove the connection at the battery when your car is running. You will do serious damage to your cars electrical system,
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