Thanks for responding, Woody.

I pulled wires off the relay and tested the pink/yellow circuit for potential voltage. There was none. I cracked open the relays and could not see the diode. There is a circuit diagram that says there is a diode.

I dont have the internal relays as I had them modified by Electronize.

I have thought of having a go at randomly replacing components back from the yellow wire in the hope that I can get it back to life.

I should have stuck with the internal relays.