dkg520 481 #1 Posted September 27, 2021 I have a agreement with my local metal recycling company to give me a telephone call if a Wheel Horse is brought in to be crushed. So they call me with a 312-8 with the Koehler Magnum 12 motor but the wiring is both melted or cut all to shreds. But the price was right so I loaded it up and am attempting to get it running. Well after about a week of trial and error I have it starting with the ignition as long as I unhook the ground wire from the rear of the ignition switch. Of course with the ground unhooked the motor will not turn off using the key. If I hook the ground wire to the rear of the ignition then I have no spark and the motor will not start. When I have the motor running it runs great. What am I doing wrong? Thank you for any suggestions. Share this post Link to post Share on other sites
Achto 26,199 #2 Posted September 27, 2021 Bad or wrong ignition switch?? Check to see if the M terminal on the switch is grounded all of the time (off, run, start). If it is then the switch is bad. 1 Share this post Link to post Share on other sites
WHX?? 46,404 #3 Posted September 27, 2021 Sounds like you need to either. 1) Rewire the entire tractor. 2) Parts her out given that it was a ready headed for the shredder. 3) Trouble shoot the existing wiring as Dan suggested . 2 Share this post Link to post Share on other sites
pacer 3,159 #4 Posted September 27, 2021 No help with your problem, but ...... I really like the title of your post "Ignition DEMONS!!!" Man, that is .... soooo descriptive of the way those things fluster a guy 1 Share this post Link to post Share on other sites
gwest_ca-(File Mod) 10,444 #5 Posted September 27, 2021 Share this post Link to post Share on other sites
dkg520 481 #6 Posted September 27, 2021 It’s really to nice to part out. But I appreciate all your advice. Tomorrow’s another day and I will take another try. Share this post Link to post Share on other sites
953 nut 51,023 #7 Posted September 27, 2021 Too bad the previous owner botched up the wiring but you wouldn't have gotten such a good deal if he hadn't. At least he didn't get voltage to the Mag and fry it. Have you checked the wires to the PTO and seat switches? 11 hours ago, dkg520 said: the wiring is both melted or cut all to shreds. Carefully pull apart the melted wires to see where each goes and replace them one at a time. 1 1 Share this post Link to post Share on other sites
dkg520 481 #8 Posted September 28, 2021 Pulled all the melted wires and replaced. Got a new ignition switch and everything is working as it should except the lights. I will rewire the lights when I have the time. Thanks for all the comments, Share this post Link to post Share on other sites
pfrederi 17,041 #9 Posted September 28, 2021 (edited) Some 312 -8 came with unregulated 3 amp systems. if there is no regulator it is the 3 amp system. The lights run directly off the stator only work when engine is running Edited September 28, 2021 by pfrederi Share this post Link to post Share on other sites