MOT approaches and 3 amigos rear their heads. Once I've changed the shuttle valve , should the lights go out or do I need to get them switched off? As you'll guess they're still on. They came on when I disconnected all the electrics so I could remove the engine bay fuse box whilst welding the inner wing. Have checked all the connections and fuses and they're all ok so common consensus was the shuttle valve , which is now done but hasn't dispatched the amigos. Any thoughts?