DrewE wrote:
What Old-Biscuit and Chris said should work for you. The main problem you're having is using the +7.5 rather than ground as the common. It's a very understandable blunder as the Dometic system is somewhat unusual (certainly compared to normal domestic thermostats) in switching to ground/common.
***Link Removed*** describes what I did to update my thermostat; it's the same thing, but a couple of wire colors were a bit different.
Thanks Drew for the link. I must have been typing my messages the same time you were. I didn't see your original post. And thanks to old biscuit and Chris for their information as well. It has been very helpful. Wish this information would have shown up when I was doing my google searches, but nothing this helpful showed up. I just wish I would have signed up for this forum and found this information before I already returned my thermostats. So I have another one on order.....
I did finally hear back from Dometic, and they just told me I need this thermostat and control kit 3316230.000 which as I understand it would require rewiring the setup. So I'm glad I found out about this ground wire from the forum members here before wasting time and money with that setup.....
