Originally Posted by notanlines
the fridge works fine on 115 vac, but I can't get it to work on 12 vdc. anyone tell me how to test it, maybe I have the little black electrical switch in the wrong position? I don't even know how to check to see if it has juice going to it. Many thanks in advance. We're on our way to Florida and using a cooler instead.
There is a previous post [below] that might be of help:
My first thought is that you are not getting 12vDC to your fridge control circuit. You will need a volt meter to determine this. I assume you have checked all the 12v fuses and made sure there is not one blown to the fridge? If your control knob turns freely you may have some contact dirt or buildup.If it is somewhat difficult to turn then you probably have some dirt buildup that is addressed in this link.
Before removing the control, you might turn off the AC circuit breaker to the fridge and remove the 12v fuse also removing all power to it, then move the control full cycle several times in case there is dirt or electrical residue on the contacts. Oftentimes due to non-use,there will be a natural buildup on contacts that prevent voltage flow. This may remove any buildup by just 'exercising' the control knob. This failing, a physical examination of the control switch will be necessary which entails removal. A good cleaning of the contacts using a non-electrical cleaning solvent and air hose may be necessary. Insuring they are making good contact should put your fridge back to good working order.
I hope this helps.