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Do you have a small digital multimeter so you can take some DC voltage readings? Have you had the batteries serviced recently and how old are they? Make and model of your converter or load center? Get back to me with this information and I can assist you further. R.J.
And when you jumped the fuse you toasted the thermostat? What about the batteries?
And did the thermostat get fried when you jumped the fuse?
Then from what you have told me, it would appear that there is a problem with the compressor relay and that is causing the fuse to blow and if you bypass this then it will burn up the thermostat. That needs to be tested. It may be a problem with the compressor itself. Testing would show what the condition is. That would take a tech with the knowledge of this system. Hope that proves helpful here. Please get back to me if you need more as all follow ups are included in our fee.
Sorry..........I forgot that you told me that. Long day! So if it works that way it would appear that the thermostat just gave out at that point and replacing it would solve this. You might be able to upgrade to a newer version as well. Thanks for giving me a good description of the things you tried.
I am trying to fully understand what was said before.........did you replace the thermostat already? IF SO, was it the same model or a different one? IF it wasn't the same, it may not be compatible with your system. There should be a part number on it once you take the cover off. R.J.
There are a number of thermostats that have the same PLUG(s) on them, but they aren't compatible with every Mach 3 model as they have made numerous variations of this A/C. Did you keep the OEM part you replaced? See the link below for a list of the current thermostats. Take the covers off the ones you have and check the part numbers. Give them to me and the OEM if you still have it? http://www.rvcomfort.com/rvp/pdf_documents/2013_tstat_catalog_upload.pdf
This version doesn't use a compressor relay. So, I would look for a chaffed wire harness that would cause a short sometimes. That makes more sense from what you just shared. See the link here showing the parts for this model. Check this and get back to me tomorrow. I am calling it a day as it is late here and I have to get up early to get to my "day job".............thanks for hanging in there on this! R.J. http://www.rvcomfort.com/rvp/pdf_documents/r524.pdf
I would have to make a call tomorrow and find out which one from the list is the correct version. I will get back to you early tomorrow.