Thanks for the reply Russel,
I have gone over the module with the multi meter again. I can confirm that I get a constant 12V feed from the blue and red wire.
I have the flat plug type that has 5 large pins up top and 7 small pins down below.
The module is a Trailer tow module AM5J-19H378-AC
The output pins on the module only show about 5v in a pulse.
What is WDS?
Its as if the module is being sent a signal telling all lights to flash as something isnt set up right...