adsm08 4,409 #1 Posted 9 hours ago The guy across the street, who used to do mower repair professionally, recently bought a 312-8 with no spark. He hasn't been able to figure it out, and I have looked at it yet, but I'm not super familiar with the Magnum engines and I'm not real sure where to start. Share this post Link to post Share on other sites
gwest_ca-(File Mod) 12,223 #2 Posted 9 hours ago First thing I would do is disconnect the wires between the engine and tractor harnesses. Wires will come out on the back side from behind the flywheel. If it then runs it will not shut off because the ignition wire is not grounded. A model number and serial number will give us a chance to look at how it is wired. 1 1 Share this post Link to post Share on other sites
953 nut 65,847 #3 Posted 4 hours ago The four wires blocked in red are the two oil switch wires are blue, white for charging and Dark Blue is the one that grounds the Mag to stop the engine. Share this post Link to post Share on other sites
Achto 31,752 #4 Posted 3 hours ago Solid state ignition, Either the coil is grounded out or it is bad. Share this post Link to post Share on other sites
