budman2 57 #1 Posted July 26, 2018 (edited) I have a 1987 310-8 wheel horse that I have been messing with for about a week on and off, the engine will not shut off with ignition switch! I put a new switch on it and it still will not shutoff with the switch! Is there anyone out there that can give me some advice as to where to look for the fix? Thanks in advance budman2 Edited July 26, 2018 by budman2 Share this post Link to post Share on other sites
pfrederi 17,116 #2 Posted July 26, 2018 Is the housing of your ignition switch grounded? Check resistance form the switch housing to the battery - terminal should be near 0.00. If the switch housing is not grounded then the M terminal will not be gounded out in the off position. 1 Share this post Link to post Share on other sites
budman2 57 #3 Posted July 26, 2018 Thanks for the info, I'll check that out today man! Share this post Link to post Share on other sites
pfrederi 17,116 #4 Posted July 26, 2018 If your new ignition switch has a brass G terminal (6 terminal type) run a jumper from that to a Known Good Ground...You can trust your mother you cannot trust your ground. Share this post Link to post Share on other sites
budman2 57 #5 Posted July 26, 2018 Yes it is a 6 terminal type, Yes Sir I will check that also! Thanks budman2 Share this post Link to post Share on other sites
wallfish 15,905 #6 Posted July 26, 2018 as pfrederi suggested, switch may not be grounded properly. Common issue with those. I eliminated the intermittent ground problem by running a new ground wire directly to the body of the switch behind the dashboard. 1 Share this post Link to post Share on other sites
budman2 57 #7 Posted July 28, 2018 Found the problem with the not shutting off with the key! it was a dioad that plugged into the coil modual, buy passed it and it shuts off now ! Now the motor dies when I try to use the pto! replaced both micro switches and still have the same problem! any ideas on that guys? This 310-8 is getting to be a pain! thanks for all your help so far guys, budman2 Share this post Link to post Share on other sites
gwest_ca-(File Mod) 10,478 #8 Posted July 28, 2018 Check your seat switch. It controls the ignition when the pto is engaged. Operator falls out of seat with mower going and motor quits. You should replace the bypassed diode. It was added to protect the module from stray voltage which releases the magic smoke in the module and ignition coil. Garry Share this post Link to post Share on other sites
budman2 57 #9 Posted July 28, 2018 Thanks Gary, do you know where I can find the correct diode? budman2 Share this post Link to post Share on other sites
Lee1977 6,210 #10 Posted July 29, 2018 It the two 1/4" philips screws holding the dash panel are rusted or not tight it can cause the engine to not cut off. I've had that problem. Also I have had to push hard on the key when turning off the engine to get it ti shut down, that was a couple months ago. It's been working fine the last times I've used it. Share this post Link to post Share on other sites
gwest_ca-(File Mod) 10,478 #11 Posted July 29, 2018 18 hours ago, budman2 said: Thanks Gary, do you know where I can find the correct diode? budman2 At one time I would think Radio Shack but they have disappeared haven't they? Anyone that repairs electronics will have. Any small common diode will work but a 6 amp is larger in size so not as delicate to handle and will take more physical abuse. Garry Share this post Link to post Share on other sites
budman2 57 #12 Posted July 29, 2018 Thanks Lee & Garry maybe I can geter done now! its been about a month of spare time so far working on this thing, never had this many problems with the electric parts before! budman2 Share this post Link to post Share on other sites
gwest_ca-(File Mod) 10,478 #13 Posted July 29, 2018 Found this. Click on the picture and again on the page that comes up Garry 1 Share this post Link to post Share on other sites