If it has numbers on the bottom, or top/sides, the number can be referenced at a NAPA, or possibly google for it (put in voltage regulator xxx-xx-xxx) filling in the number as printed on the reg. If no numbers are on it, the pull in voltage of the cutout relay would do it.
With the following items a 6v battery, a variable voltage supply from 0-20 v, the Voltage reg in question, a volt meter (if the power supply does not have one built in), and some jumper wires.
Connect the battery + to the Power supply + Connect the power supply - (with the volts at zero) to the arm terminal of the reg. connect the Bat term of the reg to the - battery post. Connect the volt meter across the Arm to Bat terms of the VR with the black lead on the arm terminal.
Begin turning up the voltage watching the meter. as the voltage gets between 7 and 8 volts, a click should be heard as the cutout closes, and the meter across the relay should go to zero. This is a 6 volt reg. If it gets to 13 volts or more before clicking, it is 12v. If it does not close, or is permanently closed already, it is toast. JimN
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