I just bought a weedeater model WE12536A riding mower it has a Briggs 12.5hp engine, it runs fine and transmission works good. The only problem I have with it so far is that when I engage the blades it dies unless I hold this little red switch that's under the hood. When the blades aren't engaged the arm rests under the switch making contact with it and when I engage the blades the arm comes off the switch and the mower dies. I'm sure this is just a wiring problem and was wondering if anyone new where to find the wiring diagrams for this mower?