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Founder, 1929-2014
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Runtz 12 Volt to 6 Volt Reducers

SAME DAY SHIPPING! Order within the next 13 hours 7 minutes and receive same day shipping

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Use with gauges, not heater fans or radios.
Runtz 12 Volt to 6 Volt Reducers

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Q & A

What's in the Box

"Runtz" transistorized reducers allow you to use your original 6 volt electronic devices (like gauges) on a vehicle that has been converted to 12 volts. You will need a "Runtz" for each 6 volt electric gauge on your car.

Designed for 12 volt negative ground systems only. Screw type terminals. 1.5 ohm resistance, 4 amp max load, 25 watts.

910-64101 Instructions (PDF)


Note: Never, ever use ceramic block style reducers for gauges, radios or lighting. A power surge will destroy the electronics when first turned on. Ceramic block reducers should only be used to operate 6 volt DC motors and fans on 12 volt DC.

You may also be interested in:

Electric 12 Volt to 6 Volt Reducer for Motors
(Part #91064103)

This voltage reducer allows the use of an original 6 volt heater blower and switch in a vehicle converted to 12 volts. Safer and much more reliable than the less expensive ceramic type voltage reducers. Compact 1" x 1" x 3" size occupies little space. Reducer works with up to 10 amps of continuous current draw.

Note: This reducer generates a fair amount of heat when in use. It should be mounted to a non-flammable object, preferrably near cool moving air while the vehicle is in operation.

910-64103 Instructions (PDF)

Voltage Reducer for Fans & Motors
(Part #91064102)

You can use this voltage reducer to operate 6 volt DC motors and fans on 12 volt DC. Ceramic insulator with embedded coil and screw-type terminals. 1.5 ohm resistance, 4 amp max load, 25 watts. Mounting stem has 7/16"-28 threads.

Not to be used with gauges, radios or other electronic items. We recommend part 910-64101 for gauges.

Book - The Official 12 Volt Conversion Guide
(Part #91085180)
                        This guide book takes you step by step through the formerly terrifying task of converting your hot rod from 6 volt to 12 volts.   

Includes the secrets to generator and alternator conversion and hook-up, lighting, gauges, ignition, starters, troubleshooting and more. There's even a cross reference from 6 to 12 volt bulbs.

Twenty pages. Small easy to handle size 8-1/2" x 5-3/8".