12V Power Lines for Fridge

[david_h]

I have a practically brand new fridge in my 400DB installed by the PO. 14 months old so still in warranty. Unfortunately the PO went with a Norcold. Model DE0061L.

The fridge runs fine on 120VAC but allows the freezer to thaw when running on 12VDC. Betteries in the boat are brand new and were measured to be reasonably charged during recent tests. I even used thermometers in the fridge and freezer compartments to verify that on 12VDC the temps are not nearly as cold as the are while on 120VAC.

i talked to Norcold and then to a reputable service center and it was felt that the power converter on the fridge was bad. I took the power unit in but it came back as being OK. The service tech said that the wire gauge supplying 12VDC is likely the cause and to check it out.

Looking at the installation manual it states that for wiring runs beyond 20 feet that #10 wire should be used. The existing wiring looks to be #14 or maybe #12. The power runs to the fridge are very likely longer than 20 feet.

Has anyone had to 'UP' their wire gauge running to the fridge?
Any ideas on the route that the wiring takes?

I plan on first testing with a spare house battery that I have, by connecting it directly with automotive jumper cables. Then further testing with an approximate piece of #10 before I start pulling new wire in.

Any comments would be appreciated.

thanks

Dave

 

[jthatcher]

Measure the 12 volt level at the fridge while it is running to check voltage drop. This will let you know if the wire gauge is too small. You should still have a full 12 volts (or nominal battery voltage).

 

[Robski97]

A Bad battery will also cause unit not to switch. I had this issue . I had a bad house battery and wasn't aware.

Rob

 

[ASH]

I unplugged the 12v source & plugged the fridge into the 110 outlet it was using. I always have my generator on & use shore power at dock. Works great now, I used to melt a lot of ice before I changed it.