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Hi! My name is ***** ***** I can assist you with this. I may need some additional information from you first in order to give a complete answer.
When you say "it appears to have 12 volts coming into it".........how did you determine this? Does all the rest of the 12 VDC powered systems in this RV work?
Do you have the Owner's Manual for the inverter?
I am attaching a link to the User's Manual for this make and model. Print it out if you don't have one. See section 5-4 on trouble shooting. The first things to check are the actual hookups to be sure they are correct. One reason for this not working would be the polarity is wrong. Double check that. If that checks out, follow the next step. http://www.xantrex.com/documents/Power-Inverters/PRO-Series-Inverters/975-0263-01-01_Rev-C(artwork)%20(1).pdf
Get back to me with what you find and we can go from there. I will also make a phone chat offer for you. Small extra fee, but some of our customers prefer this and no time limits or limit on number of calls to get the problem resolved.
Just wondering if you were able to resolve this with the help I provided? If not, please get back to me and we can sort this out. Thanks!