Chauzers,
I probably wasn't clear on the store/use switch in my original post. Rather, I tied it into the relay that makes the clicking sound when you switch from store to use. On my 27K Hurricane it is located under the short dinette seat just behind the fuse and breaker panel. It looks like the starter relay on a car and is bolted to the floor on mine with unswitched power on one post and switched on the other. I used a volt meter to check and see which poll was powered depending on the actual Store/Use switch position.
Good luck, let me know if you need more info. I am no electrician but my Dad was an electrical engineer and I picked up a few things along the way. There is probably someone on here that can offer better advice than me.