We don't normally use our fridge in 12V mode but for the 4th, thought it would be convenient to load the fridge before we went. I had it running for several days on 120V power. I have a cooling fan that was running, and the van was running (with charging wire) as well as the pup battery. Switched off the 120V power and switched on the 12V power, and noticed the fan slowed way down. I have a digital voltage meter right inside the pup door... had my son read it while I tried again. Around 14V before I switched on the fridge, and 11V and falling with it on 12V. Again ,this is with the vehicle running and a pup battery. I did a resistance check across the 12V heating element and am getting .7-.8 ohm. I'm assuming that's not correct? Anyone know the value I should be seeing? Anyone know where to find this part? An Amazon listing says to use part 0173722018 but I don't see that anywhere.