Another source for wiring harnesses is brillman.com . I did a quick search and didn't see one listed for 5020, but it is worth a phone call to see if they offer them. They offer lots more than is listed. They custom make battery cables also. For 3010, 4010, 3020, 4020, they offer wiring harnesses that are already modified to convert to 12 volts. I always hate to install a new factory harness and then have to cut it right away to convert. Not that it requires major modification, but cutting regardless. They are reasonably priced and factory original in appearance and quality.