Convert from 6 to 12 Volts
Continued

CHARGING SYSTEM

The question of generator or alternator is one of, what is best for your needs. While 12 volt generators are used less often, a 12 volt generator makes it simple swap by changing out the 6 volt generator and voltage regulator. The amp meter will work fine on 12 volts, and give accurate readings. This would complete the Charging System phase of your project with no visible changes to the engine compartment. Another advantage of a generator over an alternator is that it will charge a dead flat battery.

A one wire alternator with built in regulator, which eliminates a lot of hardware, is easy to install as far as engine wiring goes. The old regulator and wiring can be removed, which cleans up the engine compartment. Usually, a bracket modification is required on most engines to fit an alternator. Aftermarket alternator brackets are available for most of the older 6 cylinder and V-8 engines. If you are even a little handy, you can modify the existing bracket to fit the new alternator by welding on a mounting boss.

To complete the Charging System you will need a 12 volt battery. Select one that meets your engine’s needs and battery box limitations. We recommend the new glass mat batteries by Optima.

INSTRUMENTATION

As stated earlier, the Amp meter will work just fine and read correctly on 12 volts. The fuel gauge will need to have a dropping resistor attached between the positive terminal and the positive wire supply power to the gauge. This type of dropping resistor is available from most of the classic parts suppliers for about $10.00. Do not use the large load dropping resistor you will need to run fan and wiper motors. As most older trucks use mechanical oil senders, there is nothing not much to do here.

Next, all the instrument light bulbs need to be changed to 12 volt. If you forget this part, you will be reminded one night in a bright flash and drive home in the dark.

Don’t for get the radio if you have one. The best way to handle to power requirements for a 6 volt radio, would be to contact your local automotive radio repair shop. From experience, I know that operating a 6 volt, tube type radio off a dropping resistor is bad news. Supply wire size is also a factors to take into consideration for older radios. This is an area best left up to the experts, if you can find one.  Old radio people seem to be very hard to find.

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