jay cee 0 #1 Posted March 10, 2022 Have a 1985-wheel horse 310-8 with a Kohler cast iron M10 engine. The 5-pin plug between the engine and the main tractor wire harness is missing. I am trying to determine what wires from the engine (2-reds from oil switch, 1-white, 1-black and 1-yellow) connect to what wires in the tractor harness. Can anyone help or direct me where the answer is. The manual I have doesn't show the missing 5 pin plug. Share this post Link to post Share on other sites
roadapples 6,983 #2 Posted March 10, 2022 Someone will be along that knows more about wiring than me, but Share this post Link to post Share on other sites
Jeff-C175 7,199 #3 Posted March 10, 2022 1 hour ago, jay cee said: help or direct me Welcome! If you haven't yet found it, there is an extensive selection of manuals here that cover all aspects... particularly wiring diagrams. https://www.wheelhorseforum.com/files/ 1 Share this post Link to post Share on other sites
lynnmor 7,216 #4 Posted March 10, 2022 Try this file, Look at the wires coming from the engine and imagine your plug there. 2 Share this post Link to post Share on other sites
953 nut 54,145 #5 Posted March 11, 2022 Is the engine you are wiring up the to the 310 the one that came on it or is it a replacement engine? The wiring diagram that @lynnmor provided shows a three wire plug with a white wire for 12 volt DC to charge the battery, a green wire for unregulated AC for lighting and a yellow wire going to the ignition coil. There is no oil sentry shown and they are usually dark blue wires. This would have left the factory with a Kohler K series engine having battery ignition, not an M series. Please give us the engine Spec. number and double check the year of your 310 so we can be of more help. 4 Share this post Link to post Share on other sites
JoeM 7,870 #6 Posted March 11, 2022 15 minutes ago, 953 nut said: Is the engine you are wiring up the to the 310 the one that came on it or is it a replacement engine? Or is the tractor it a newer model? 87's had magnums. 1 Share this post Link to post Share on other sites
JCM 9,037 #7 Posted March 11, 2022 @jay cee Just for reference here is a picture of a restored 1986 312-8 with an original K-series Kohler and an original 1989 312-8 with a M-12 Magnum Kohler. @JoeM @953 nut By looking at the engine shroud you can see the difference. 3 Share this post Link to post Share on other sites
JoeM 7,870 #8 Posted March 11, 2022 24 minutes ago, JCM said: Just for reference here is a picture of a restored 1986 312-8 with an original K-series Kohler and an original 1989 312-8 with a M-12 Magnum Kohler Definitely a transition period for WH engines. 1985 and up. 1 Share this post Link to post Share on other sites
