HP86B/HP85 PSU testing - where to start?

Hi list, You may remember the big stack of HP85s/HP86Bs I pulled from a dumpster a few months ago. They've been stored away safely since then, and now I'd like to get started testing them so that I can get them sold. Tony recommended running the power supplies on a dummy load to make sure that none of them are duds. I have a handy bag of Big Resistors that I can make dummy loads out of, however, (in an 86B at least, I've not been into the 85s yet) there's a 10-conductor cable coming out of the PSU and I've no idea what sort of load it might want to see and on which pins. Googling for the service manual hasn't been productive. Can anyone advise? I have the basic tools (multimeter etc., and some cantankerous old oscilloscopes) but don't have any experience doing this sort of thing. Thanks, Ed.