How to Wire a 6 Volt to a 12 Volt

By William Kinsey
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There are two ways a 6-volt and 12-volt battery can be connected. The first is a series connection. In a series connection, the two battery voltages will add together to provide a combined voltage of 18 volts. The second configuration is a parallel connection. This configuration requires a voltage splitter or isolator to keep the 12-volt battery from overloading the 6-volt battery. In this case, the total voltage will be between 6 volts and 12 volts.

Place both batteries on a table. Cut off six 3-foot pieces of 16-gauge wire. Strip half of an inch of insulation off of the ends of each wire. Connect the positive terminal of the 6-volt battery to the negative terminal of the 12-volt battery using the 16-gauge pieces. This places the two batteries in series.

Use a voltage meter to measure the voltage across the two batteries. Turn on the voltage meter and place the red positive probe on the positive terminal of the 12-volt battery. Place the black negative probe on the negative terminal of the 6-volt battery. The voltage should be at or close to 18 volts.

Disconnect the wires on the batteries.

Connect the positive terminal of the 6-volt battery to the positive terminal of the 12-volt battery. Connect terminal one of resistor #1 to the negative terminal of the 12-volt battery. Connect terminal two of resistor #1 to terminal one of resistor #2. Connect the negative terminal of the 6-volt battery to terminal one of resistor #2.

Check the total voltage for this circuit. Connect the positive probe of the voltage meter to the positive terminal of the 12-volt battery. Connect the negative probe to terminal two of resistor #2. The voltage should be between 6 volts and 12 volts. The two resistors act as voltage dividers to reduce the voltage of the 12-volt battery to a 6-volt level so that the 6-volt battery can be added to the configuration.

About the Author

William Kinsey lives in Concord, N.C. He started writing articles in March 2009, which have appeared on Autos.com and CarsDirect.com. He currently holds a Bachelor of Science in electrical engineering from the University of North Carolina at Charlotte and a Master of Business Administration from the University of Phoenix. He also has several years experience as an outside plant engineer and planner with AT&T. He also currently owns and operates Sophisticated Curves, an online fashion mall that caters to the needs of plus size women.