Trige,
That model reel uses spring loaded contacts against copper rings on the reel to transmit the power from the rotating reel to the stationary cord running into the coach. You will have to take the contact box apart to determine if the contacts can be cleaned and/or repaired. The problem with these reels is that most if not all of them mount the contact rings onto a plastic backing that will melt from the excess heat caused by a poor connection thus making a good repair difficult to impossible without new parts. First, you need to determine the extent of damage, and if new parts are necessary, and can not be fabricated, contact the manufacturer to see if they will supply the needed parts, or a new reel is needed.
Gerald