www.iFourWinns.com

Works great plugged into shore power. The 12 volt switches on the main panel are on fuse is not popped.
I know we need to take the panel out and find out if there's power behind there. Any other ideas

Do you mean no light on - no power.
Do you mean not cooling - light on though.
If no cooling - chances are the dreaded wire gauge too small issue.
Has it been working in the past and just stopped?

Could be the inverter but I doubt as it is normally a straight thru on DC power and converts AC to DC.

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The Dance II
2007 278 Vista
6.2L Mercruiser

There is no power at all on 12v
I recently picked up the boat and I did not catch this prior to buying in the fridge did work on shore power.

-first check power at the switch in the panel

- then most likely pull the fridge out and test with some different wire

so it almost has to be the 12 volts coming to the fridge, since basically the fridge runs on 12 volts, and it is working on 120v shore power.... double check the fuses with a meter

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Current:
2000 Sea Ray 380 Sundancer "still Livin the Dream"

Past
2002 268 Vista 5.7 GXI "Livin' the Dream"
1996 Rinker 192 Captiva. "The Simple Life"
1999 Yamaha XLL 1200 Waverunner.
1976 Mercury Marquis tri hull 120 hp

Typical culprit for this issue is undersized DC wiring causing to much voltage drop which triggers the refrigerator's automatic cutoff.

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2004 Vista 298
Twin 5.7L Volvo Penta GXi-E

There is a light in the cabin refridgerator on a 298? I will have to see if my 2001 has one.

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2001 Four Winns 298 Vista
Twin 5.7 Volvo Penta GSI DP

Diagnosing norcold refrigerator that doesn't work on 12v.

4 screws hold the fridge in around the outside it should slide right out.
There is a fuse on back of fridge
Test fuse
Test red lead on the 12 volt power coming in and the other lead to ground
Mine was around 11.6 volts I didn't think that was to bad
My compressor would kick on and back off but fan would run
Test the voltage when the compressor is trying to kick on
Mine would pull down to 10.4 when load from compressor was applied
Replaced the wire with heavier wire and it worked fine

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2001 Four Winns Vista 248 by rick2752, on Flickr

Yes this was the problem for my 328 Vista. Today I pulled the fridge out enough to sit a battery down and a short run of heavy wire. Ran great for a few hours. Then I had to go but I'm running maybe #10 wire from the breaker to the refrigerator.

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-JD, 2003 328 Vista

Update-Yes the fridge works fine now running on 12 volts after I ran larger wire from the breaker around to the refrigerator. I sort of may have went over kill but with #10 wire and a two hour cruise to home port the fridge was finally still on when I got back.
Now the test will be overnighting on the hook it should stay on all night.

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-JD, 2003 328 Vista