You have to dig the Load relief relay out from the box
There is a supply side which is always live and the Supply side that is powered when the relay is powered up by the ignition
So basically you want to connect to the Supply side rather than the always live side
When you press the starter button the relay is powered down and the supply side goes to zero and the ABS mod relay disconnects the ABS
When you release the starter button That side of the relay gets power again and the ABS mod relay will connect and the ABS circuit will be remade and at that stage the ABS unit does its self checks and as the engine is running there is never a low power fault code