John- Sorry to have missed your post on this. Yes, I think your assumption is correct. If your at the rally you'll no doubt find someone there to show you. If your not you can ring me at 760-644-1543 and I can try to help. We have exactly the same year coach. I need to know where to find my aux air compressor. I have a breaker for it but no clue where it is. It does not appear to work wherever it is.