Thanks a lot shovel bob,been wondering a week where that went !!! and sorry pain xxx as this was your thread . Yes mine was staying on/flickering off because the copper v bit was missing ,
Pain xxx it goes inside the housing split end in front left side off housing and seems to push BL switch back a tad .
If you take your housing apart and its there still, loosen the 2 bracket screws for brake cylinder and lift up a bit to pull inline more .

Thanks again Bob