Another possibility for those clips is a connection to charge the engine battery from the house system. Older Winnies do not have this function built in, and the engine battery can run down if you camp in one spot for weeks at a time. Hooking up a jumper to the house system gives a way to easily charge them.
In any case, it's not a standard part of the hook-up, so that's not the cause of your other problem.
Former owner of 2004 American Tradition and several other RVs
Home is West Palm Beach, FL