Forum;
Results are in on the tests of Gordon's failed V-Stab...but I won't spoil it by giving away the root cause here, I will say that the V-Stab was not found to be defective!...I'll let those interested read all the gory details in this SW-EM Tech Article:
https://www.sw-em.com/voltage_stabilizer.htm
...the question if V-Stabs of voltages other than 10V (Average) were produced has been also been answered...yes, these were manufactured, but for use on Ford vehicles of the era. These 5V (Ave.) output V-Stabs are not suitable for use in Volvos (of any year).
Cheers