Jimmad
Guest
Hi, I wonder if anyone can help with a problem on a Dometic RM 7655L fridge / freezer?
We have recently bought a 2006 Hymer B654, which has this Dometic fridge installed. It was a private sale and when we bought it the previous owner said that the 12v relay behind the fridge was constantly clicking, this didn't sound to be too serious so and we loved the van so bought it regardless thinking we could replace said relay for a fiver and we would be ok!
However. I am now not so sure it is the relay which is at fault here. I have the manual which includes a circuit diagram and multimeter so had a bit of check. This is what I have found;
The relay control connections (two thin white wires) are live when the engine isn't running. Therefore closing the relay and delivering 12v and 15amps to the fridge heater connection with the engine not running.
With the engine running the voltage across the relay control feed drops to 3-4v and of course not enough to trigger the relay and therefore doesn't operate the fridge!
The yellow D+ connection from the alternator works fine and is 0v with the engine off and 14v with the engine running.
As I had already bought a replacement relay I changed it just in case, however it didn't make any difference.
So it would seem the circuit is working backwards - ok with the engine off and shuts down with the engine running! Has anyone any experience of this, or advice please?
Thanks
We have recently bought a 2006 Hymer B654, which has this Dometic fridge installed. It was a private sale and when we bought it the previous owner said that the 12v relay behind the fridge was constantly clicking, this didn't sound to be too serious so and we loved the van so bought it regardless thinking we could replace said relay for a fiver and we would be ok!
However. I am now not so sure it is the relay which is at fault here. I have the manual which includes a circuit diagram and multimeter so had a bit of check. This is what I have found;
The relay control connections (two thin white wires) are live when the engine isn't running. Therefore closing the relay and delivering 12v and 15amps to the fridge heater connection with the engine not running.
With the engine running the voltage across the relay control feed drops to 3-4v and of course not enough to trigger the relay and therefore doesn't operate the fridge!
The yellow D+ connection from the alternator works fine and is 0v with the engine off and 14v with the engine running.
As I had already bought a replacement relay I changed it just in case, however it didn't make any difference.
So it would seem the circuit is working backwards - ok with the engine off and shuts down with the engine running! Has anyone any experience of this, or advice please?
Thanks