Solid-State Voltage Regulator Conversions

A picture of the generator and terminals will help us. We need to know, the output polarity, and if the regulator energizes the field to +12V or pulls it to ground. It is all about internally how the the field is connected to ground or the output.

http://www.airheadparts.com/vintage...s/voltage-regulator-bosch-12-volt-113903803-e Here is a solid state regulator that might work and fit in your box. Again it all depends on what you have.