Vintage Auto Garage's FREE conversion guide provides step-by-step instructions to convert an American classic car from its original 6 volts to a modern 12 volt system. In addition, the guide explains the design of these vintage auto electrical systems and details the parts needed to complete the conversion. Vintage Auto Garage can develop a complete parts list for your specific car here. You can shop for individual parts here.
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When you increase the voltage of the battery, you decrease the amount of amperage or current needed to drive an electrical device. So when you change from 6 volts to 12 volts, you are doubling the voltage and thus decreasing the amperage in half.
This is why you can use the same wiring and switches in a 12 volt system as you have in your 6 volt system, because the 6 volt wire is essentially twice the size or gage as needed in a 12 volt electrical system. This means you do not need to rewire your entire vehicle when converting to 12 volts. But there are some parts you do need, such as…