budman2 57 #1 Posted May 23, 2022 (edited) I have an old 12 hp kohler engine on a wheel horse that has a part in the harness that is suppose to prevent the back feed of the current! anyways the current does not want to go thru it! does anyone know the name of the part that I am talking about? fixed one be fore about 20 years ago but do not remember what I done! any help would be nice, thanks in advance, budman2 by the way this is the old coil & points type!!! Edited May 23, 2022 by budman2 Share this post Link to post Share on other sites
953 nut 51,677 #2 Posted May 23, 2022 Are you talking about the diode on the 3 amp charging system? Share this post Link to post Share on other sites
budman2 57 #3 Posted May 23, 2022 (edited) Does a diode only let the current go in one direction? Sorry I am ignorant when it comes to the electrical systems! budman2 My old friend on here ( my wire man passed away a few years ago, Brent known as Bowtie on here) sure miss him! he fixed all my wire problems!!!!!! Edited May 23, 2022 by budman2 Share this post Link to post Share on other sites
953 nut 51,677 #4 Posted May 23, 2022 9 minutes ago, budman2 said: Does a diode only let the current go in one direction? Yes, it is like a check valve for electricity. Please post the model number of your so we can be sure that you get the correct part. Share this post Link to post Share on other sites
budman2 57 #5 Posted May 23, 2022 (edited) No numbers on the seatpan, but this is the number on the engine, Spec# 47812 & Model # K301S, hope this helps ID this thing!!!!! budman2 Edited May 23, 2022 by budman2 Share this post Link to post Share on other sites
gwest_ca-(File Mod) 10,496 #7 Posted May 23, 2022 Tractor model number is 21-12K801 - only year to use 47812 spec number 1 Share this post Link to post Share on other sites
953 nut 51,677 #8 Posted May 23, 2022 That is a good number. You have a 1985 312 with a K-301 engine. The attached wiring drawing shows a little arrow like thing next to the engine connected to a white wire, that is the Diode. There will be a little lump under some tape on the wire near the engine block, the diode is under the tape. Perhaps @gwest_ca can tell us where a replacement diode can be obtained. You will need to solder the new one in place of the old one, engine vibration would too much for a mechanical connection. 1 Share this post Link to post Share on other sites
gwest_ca-(File Mod) 10,496 #9 Posted May 23, 2022 If you have access to a Radio Shack you should be able to walk out with a 6 amp replacement diode. We no longer have RS in Canada Any electronics repair shop should have them. 1 Share this post Link to post Share on other sites
953 nut 51,677 #10 Posted May 23, 2022 Also, ask the person who sells the diode which end should go to the engine (AC input) and which end will give you the + DC output. 1 Share this post Link to post Share on other sites
budman2 57 #11 Posted May 23, 2022 Thank you all very, much! now I stand a chance to get it fixed!!!!!!!!!!!!! budman2 2 Share this post Link to post Share on other sites
