I will try to give you some information, although I am not sure how the 05's were done. The sales brochure says you should have "Siemens® solar panels - (2) 50-watt/3 amp". The best way would be done with an amp meter, but this should not be done by those without the tools and electrical knowledge. The easiest way to see if they are working is to check the battery voltage in the morning and then around noon, obviously on a sunny day. This can only be done when you are not charging the batteries and are not applying any heavy loads. The noon voltage reading should be higher than the morning. You should be able to get the voltage reading from the Xantrex control panel in the coach.
On my 07 there is a controller by the electric panels under the bathroom sink, which has the red light to show when it is charging. When the light is on you can be pretty sure that the system is working. The power from there feeds into the batteries through a fuse in the fuse block located in the battery compartment. You can not see the actual connection, it is into one of the large battery feeds.
2007 Limited SE 40fdts
Las Vegas, NV