If you have done that, wired a Neg to a Live, it's no wonder they don't work ... you have taken the earth away from the LED's and they won't work if you do that.
Also if they are 100W lamps and ther are 2 of them, that's an additional 17Amps that the feed (the one i've asked you about but you haven't replied) has to provide, there is likely to be more than just a headlamp not lighting ... I presume that all that current isn't passing through the column light switch ?