I removed the relay on my 440. ?I found that it worked by interrupting the ground on the windlass solenoid. ?I just wired that directly to ground and now you can run the windlass without an engine running.
Photo of mine and info document. Clive Fedida 380S2 #420 Lady Caroline in Greece
<CIMG4579 - Windlass Switch.JPG><Windlass Switch - 36.16257.10 - .12.pdf>