Glad you got that sorted. Have you tried plugging one of them in yet? What the guy said about possibly blowing a fuse just plugging it in does make a bit of sense. For a brief second as the plug goes in it might bridge the plus and minus terminals inside the jack and cause a short. If that happens, maybe you can find a slow-blow fuse that will work.
It's never too late to have a happy childhood!
Lee, WU0V, and Courtenay, N0ZDT
2011 Rockwood A128
2000 Silverado 1500 pickup
60W solar system
2000W inverter generator