Coleman Mach AC unit control box fried/2014 Itasca Elipse

Thanks for that! I think that may help in the future!

Here are the instructions for building your own 50A circuit tester, which is used prior to plugging in your MH.http://www.myrv.us/electric/Pg/tester_50amp.htm OR https://50amppowerpal.com/ is needed.
That tests for proper circuitry, it does not test for amp draw.
If you have a hard-wired EMS system it will not allow electricity into your MH breaker panel if the CG circuitry is incorrect, but it will permit low voltage into MH. To safeguard against low voltage, a Surge Guard is required: http://trci.net/products/surge-guard-rv

We have a Power Line EMS and it shows "line status" and shows Line #1 and line #2 and the total for both lines in AMPs...........we are not at the same RV park right now, because we had to leave to come get it fixed......but right now where we are it shows line #1 118 volts and 14 AMPs and line #2 is 121volts and 4 AMPS.

The breakers never did trip and we smelled burning wires for sure when they quit working. So the the wire nut connections is certainly possible........which is still odd that 2 would burn up at the same time (2 hours apart)

So if we didn't have good 50 amp service, which I suspect at this particular RV park and we had low voltage, would that burn them up?

Is there such a thing as a inline volt meter to plug into the box and then we plug into that........or how do I check what we have before we plug in? It concerns me that if this had happened when we were gone and the dogs alone in the RV we could have had a problem with them and the heat or even worse a fire........we do use a baby monitor, but if I were out of cell range, we would never know.

The actual AC control boxes burning up is VERY rare and unusual. To have 2 burn up in a very short time indicates
1. You did not have GOOD 50 amp service. The Line voltage may have been to low. You need to have the line voltage checked at the service pole. Just because you have 50 amp service does not mean your line voltage is up to par.
2. The 120 wire nut connections at each control box(installed by Winne), were NOT tight and secure and when the amperage increased and the connections loose caused them to heat up and arc and melt.
3. IF the compressor were defective and pulled too many amps, I doubt your built in EMS system would kick out the affected AC units. The BREAKER(20 amp for each AC) would trip first. The AMP draw feature of an EMS system does not really protect or kick out on an overload. What it does is "See's" the available amp service and will either allow ALL 120 appliances to run(TRUE 50 amp service, which is 100 amps total) or if NOT on true 50 amp service, will NOT allow certain higher amp appliances to even come ON depending on the panels Shed order. Does your EMS SHOW 50 amp service? Doug

PS. on TRUE 50 amp service the amp draw meter will be BLANK. If it shows the amp draw total, you are NOT on 50 amp service.