PartsAndService.com You can find it there I also have 12 b&S
bubbie, July 2009
MTD does not provide wiring diagrams for its products. You are screwed.
Duwayne Lafley, July 2008
i have a mtd riderwith a 12hp b&s moter,
i would like to know about the ignition wiring,
what wirers go where?
mike mccallum, October 2007
You can download the manuals for your tractor from MTD Products at:
http://manuals.mtdproducts.com/mtd/public/list.jsp
You will need the tractor Model and Serial numbers off the tag under the seat.
Rick, March 2006
edit
I can answer this question...
where would i find a wiring diagram for my mtd with the b&s 12hp engine?