many thx, it is now working again, saved me £30, what happened is I plugged my silver rod in - I just set up up ona couple of poles in my garden every now and then and had a massive SWR. So I felt the centre pin was not meeting in the SO239. The centre part of the socket was getting pushed up by the pin up into the bottom of the antenna when I put the PL-259 in, instead of snug fit.
When I dis assmebled the bottom of the antenna the weak solder joint in middle of coil must have come off so I was left with that loose wire and it was not easy to work out where that wire needed soldering. thx for confirming it.
So I can 100pct confirm that wire goes to centre of coil, all working great again.