Norcold 1200 operates without ground connected

[kmb1966]

I have been working on my Norcold 1200 again and have noticed that the unit will power up and operate when only connecting the 12 volt (+) supply to the rear control board connector labeled "12V". The connector labeled GND can be disconnected totally. Obviously there refrigerator is somehow already grounded somewhere, but I am wondering if this is a problem or is normal??

[kmb1966]

wnjj wrote:
It’s probably grounded through the 3rd pin of the AC power cord and I’m pretty sure it is normal.

yes, but the only thing I noticed is that it will also operate when the 120 cord is unplugged making the refrigerator go to propane mode.

[wnjj]

It’s probably grounded through the 3rd pin of the AC power cord and I’m pretty sure it is normal.