Had my fridge replaced. Old was 3-way. Asked if I wanted to replace with same type. Answered yes because I wanted the ability to use 12V if necessary. After install going through instructions and inst...
Compare the 12v power consumption ratings on the old one vs. the new one. If they're the same or the newer one draws fewer amps on 12v then your wiring should be fine. But if the new unit uses more amps than the old one you might need to upgrade the wiring. Check the installation manual on the new one and it should tell you the wire size needed.
My guess would be the newer unit is probably more efficient and uses fewer amps though.