...I have tried to get back up there but I can't, the game will not allow it. I've tried to proceed with the sparking wires on the ground level, but I cannot fix them. So I'm stuck
Personally I've never reached a point in the game where I became "stuck" and could not re-do a necessary puzzle correctly. Have you actually TRIED to repeat the steps you took to reach the platform the first time? (AFAIK there is no reason the rotating clamp won't take you back up there)
Also, have a look at the "
Is this a bug [crossed wires in The Furnace Room]" topic and that may help you sort yourself out.
By the way, you still haven't told us what version of the game you are playing. (iPAD, Android, Windows Phone, etc.)