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12 Volt - Electric Automotive Wiring

Maximum wire lengths vs. currents in the 12 volt electrical system of a car.

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Current loads and maximum wire lengths in 12V electric systems are indicated in the diagrams below.

automotive car electric wiring current load amps maximum length

print 12V Automotive Electric Wiring Chart

  • 1 ft (foot) = 0.3048 m

Current load - amps - and maximum wire length is based on maximum 0.5 volt voltage drop over the length of the wire.

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    Electrical engineering with units, amps and electrical wiring. Wire gauges, electrical formulas, motors and more.

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