gwest_ca-(File Mod) 11,483 #1 Posted September 3, 2019 The wiring diagrams show the low oil level switch used in both the NO (Normally open) and NC (Normally closed) positions for 1986 and newer K-Series and M-Series engines. The switch is simply turned 180 degrees to go from one to the other. We do not know if one or both are correct. This file description better explains the situation. Click on the picture. Not necessary to download anything. There are screenshots of the NO and NC positions. Question is what is on top - NO or NC? If you can help post the tractor model number and the engine model number if you can. Thanks for the help. Garry Share this post Link to post Share on other sites
richmondred01 2,307 #2 Posted September 3, 2019 (edited) NC is on top. K321 314 Edited September 3, 2019 by richmondred01 Share this post Link to post Share on other sites
richmondred01 2,307 #3 Posted September 3, 2019 Also the switch’s are different in some of the magnum engines. Ive got a few NOS switch’s around. Ill look for them today and post some photos. Share this post Link to post Share on other sites
buckrancher 2,694 #4 Posted September 3, 2019 the best thing to do with those switches is remove them and throw them in the garbage and put a pipe plug in it's place brian 1 Share this post Link to post Share on other sites
richmondred01 2,307 #5 Posted September 3, 2019 (edited) 3 hours ago, buckrancher said: the best thing to do with those switches is remove them and throw them in the garbage and put a pipe plug in it's place brian I agree. I have seen parts of them up in the cam and in the valve chamber. However, some folks like the bells a whistles. If people want the back in I put them back in I put them back in. Heck, I just bought my first truck with power windows. Edited September 3, 2019 by richmondred01 Share this post Link to post Share on other sites
gwest_ca-(File Mod) 11,483 #6 Posted September 3, 2019 5 hours ago, richmondred01 said: NC is on top. K321 314 1985 314 models did not have the low oil switch introduced in 1986. The next 314 was 1993 which used a M14. Thanks for the excellent photos. Garry Quote Share this post Link to post Share on other sites
biged77 113 #7 Posted September 3, 2019 310-8 1987 -- NC on top 414-8 1989 -- NC on top 416-8 1988 -- NC on top Ed Share this post Link to post Share on other sites
biged77 113 #8 Posted September 4, 2019 Here is some more info that may help. The photos below show oil relay P/N 106833 in the "energized" and "not energized" conditions while measuring resistance between terminals H and B. The relay is open (OL) when energized and closed (0.8 ohms) when not energized. The oil relay has to be closed to allow the start solenoid to actuate. So it looks like the oil level switch has to be NC on top for models that use oil relay 106833 (oil switch open and relay not energized for good oil level). I checked several tractor IPLs and they all use oil relay 106833. I've been wrong before on these electrical issues but if this analysis is correct then several of the detailed wiring diagrams in the Demystification Guide must be wrong. I agree that the oil level switch provides little benefit as long as the oil is checked before each use. Ed 1 Share this post Link to post Share on other sites
