I think it quite likely that there is a problem at the fridge and with that in mind you may find it best to check for 12v at the heater element. If there is a 12v supply to the element when the engine is running you can then assume that the element has failed ( and remove it for further check and/or replacement). If there is no supply at the element then work your way back to the relay.
In the past I had one fridge that the 12v wiring had failed at the connector where the wiring attached to the fridge, cutting back the wiring and cleaning the connector cured that one... in another fridge one of the elements had failed ( the 240v one) and checking the supply at the element quickly established the cause of problem.
I do not endorse any of this advice. I provide it to you as a service. I can neither guarantee the soundness of the advice, nor make any claims as to the outcome of following this advice. I provide it for your entertainment only. Should you choose to follow any of the advice, it is solely at your own risk. This is not intended to substitute for obtaining advice from appropriate sources and/or professional counseling. I recommend you consult an appropriate professional, counselor, and/or a trusted advisor before taking any action based on this advice. :wink:
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