Voltage Regulator 8 volt, outer appearance exactly like original cut-out, not just a diode but a complete modern regulator, no alterations needed to gen. or wiring, protects generator and electrical system from burnout. Negative ground only. but will allow you to install an 8 Volt battery and still use a stock T generator, 6 volt light bulbs can be used with this conversion, (looks like orig. cut-out)