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Fridge DC Mode Troubleshooting

Written by

Mark Haskell

in

,


11 October 2022

2018 Lexor TS Refrigerator Troubleshooting

Our Dometic RML 8330 UL fridge wasn’t working on 12 Volt DC. This had happened a couple of years ago and it was a non-working circuit breaker. This time we traced it to the DC 12V 30A relay. 

We followed the power to the relay with a multimeter.


Access the area from the outside lower vent. 

The 30 amp circuit wasn’t closing, but there was 12 volts to the control leads when we switched the control dial to DC.

The relay is screwed to the back of the fridge. 

It was easy to change as all the wires have slip-on spade terminals. 

Found a replacement online at Panther RV Products and it arrived from across the country in 3 days. The part info is:


MC Enterprise 2930385006MC Aftermarket Dometic RV Refrigerator Power Relay, just in case anyone else runs into this problem. https://pantherrvproducts.com

The replacement relay isn’t specific to Dometic Refrigerators, so search for this 12 volt / 30 amp relay if you experience a failure on your fridge.

Comments

8 responses to “Fridge DC Mode Troubleshooting”

  1. Anonymous Avatar
    Anonymous

    My relay in my 2021 Lexor is chattering so I took it out. It's a 4-pin whereas yours is a 5-pin. My fridge is also an RML 8330.

    Reply
  2. Ed Wilts Avatar
    Ed Wilts

    O'Reilly Auto Parts has the relay for $10 if you need it. An RV repair guy pointed me to a standard auto parts store – he said it's a pretty standard automotive relay.

    https://www.oreillyauto.com/detail/c/dorman-conduct-tite/dorman-conduct-tite-30-amp-4-terminal-multi-purpose-relay/cti0/84601?q=12v+30a+relay+4-pin&pos=0

    Reply
  3. Mark Haskell Avatar
    Mark Haskell

    Thanks Ed. It's nice to have local sources and O'Reilly is all over the US.

    Reply
  4. Ed Wilts Avatar
    Ed Wilts

    It turned it wasn't my relay after all – it was a bad connection in the terminal block. When I pulled the wire, it was green on the end. I stripped a bit off, put it back in after discovering that the 12v fridge breaker had popped (the round top-facing set under the ottoman), it was working fine again. So now I have a spare relay to take with me on trips, just in case…

    Reply
  5. Anonymous Avatar
    Anonymous

    Hi looking for wiring instructions, do you have them please

    Reply
    1. Mark Haskell Avatar
      Mark Haskell

      Sorry, I've not been able to find a wiring diagram for the RML 8330.

      Reply
  6. Anonymous Avatar
    Anonymous

    Hi, anyone available to show my which connectors go where on the relay, thanks

    Reply
  7. Mark Haskell Avatar
    Mark Haskell

    It is difficult to see, but we wired the new relay the same as the old relay.
    Black wire to 87
    Red wire to 30
    Small White wire to 85
    Larger White wire with the double connector to 86
    The spade in the middle of the relay (also 87) has no wire connected to it.
    -Mark

    Reply

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