Have you verified that the safety switches are all functioning correctly.
Brake, PTO, and seat switches. I have never seen the exact machine you are
working on but all the tractors I have worked on the wire colors to the safeties
are orange. I looked at the service manual for your machine and there is
a ton of info on the electrical. Worth a read for sure.
http://service.mtdproducts.com/Train...000_series.pdf
Ken