You can do it but it will be more of a rats nest then you would whant. all you need to do is run on || with eachothere one thing I would do if it is the way you need to go is go to home depot and get some 3M high vis. elec tap and tap all old wire befor you even start(maby agt both ends) this will make it easy to refrance. what I would do if you could take and do a long weekend and just doit.