A bench test of the PSU with a small dummy load saw the PSU appear to work fine. It might help to load it more to see if it still operates correctly under load. The specs for the PSU are:
22 amperes at +12.1 Vdc 60 amperes at +5 Vdc 7 amperes at +3.4 Vdc 4 amperes at -12.1 Vdc Has anyone got any suggestions for how to create a higher load in a fairly simple manner? It would take a lot of resistors or vehicle light bulbs to create some of those loads, and something heftier than a breadboard to connect them together. Thanks Rob