Tonup, I have not had any experience with the DVR2 regulator, but I have installed 2-12v, pos earth, solid state regulators to my '61 SR. 1 overheated after about 3 years and the the other, a Boyer unit, has lasted about 10 years. However whilst the 1st one (forgot the name) gave me about 13 volts when a meter was connected to it, the Boyer gave me only about 3 volts. when I called my supplier, he told me to connect it to the battery and then measure the voltage, and sure enough I got 13 volts. So be sure that you aren't getting the required voltage. By the the way, I think you generator should be putting out a bit more too, mine puts out about 22 volts, with the original 6 volt armature.
all the best
Clive