I think it will be difficult - even more so without the make & model number.
Manufacturers will generally not make circuit schematics widely available approved service agents excepted. They will not wish users doing their own maintenance, electrocuting themselves and the resulting law suit.
You may do better with a new question stating make & model and explaining the specific wiring issue you have with enough detail for a sensible answer.
Good luck...
Peccavi, January 2010
