Kenneth R Cluley 480 #1 Posted November 9, 2017 Replacing wiring on 1969 Charger 12 with breakerless ignition. Kohler engine Manual wiring diagram shows 22ohm resistor in wire from key switch to ignition coil.This is not in existing wiring or anywhere on tractor that I can locate. Anyone familiar with this resistor, it's location or if absolutely necessary. If I need one any ideas where to purchase? Thanks, Ken. 1 Share this post Link to post Share on other sites
953 nut 51,631 #2 Posted November 10, 2017 22 minutes ago, Kenneth R Cluley said: breakerless ignition. Kohler engine Manual wiring diagram shows 22ohm resistor in wire from key switch to ignition coil. I think you may be looking at the wiring for a model with battery ignition rather than the breakerless. On the battery ignition Kohler ignition coils have the resistor built into the coil. Here is the manual for your tractor which includes a wiring diagram. Share this post Link to post Share on other sites
Kenneth R Cluley 480 #3 Posted November 10, 2017 I am familiar with that manual, the Kohler engine owners manual on page 9 references the wiring for K301. Figure 7 on page 9 is what I was referring to. Share this post Link to post Share on other sites
953 nut 51,631 #4 Posted November 10, 2017 Not sure what Kohler manual you have, can you post a copy of the page you are asking about. Ignition systems begin on page 20, Section 5.4 of this manual. Share this post Link to post Share on other sites
Kenneth R Cluley 480 #5 Posted November 10, 2017 That manual shows the same diagram on page 7.9 figure 7-11. Share this post Link to post Share on other sites
gwest_ca-(File Mod) 10,491 #6 Posted November 10, 2017 The breakerless ignition is the same as magneto ignition and the ignition wire to the switch just grounds the ignition to shut it off. I think they added the resistor to limit the current in case battery voltage entered the circuit. We know that instantly burns the light gauge wire in the coil primary circuit. Hard to believe 22 ohm is enough to protect it but Kohler should know. Garry 1 2 Share this post Link to post Share on other sites
953 nut 51,631 #7 Posted November 10, 2017 16 minutes ago, Kenneth R Cluley said: That manual shows the same diagram on page 7.9 figure 7-11. I see the resistor you are referring to. I have a couple of Kohler engines with the breakerless system and have never had a problem with them. As @gwest_ca said the resistor could be acting like a fuse. If so it would probably be a very low wattage resistor so it would blow out with minimal currant flow. Perhaps @Aldon or @pfrederi can help out here. Share this post Link to post Share on other sites
Kenneth R Cluley 480 #8 Posted November 10, 2017 What wattage do you think it should be? I think only available in 10 watt max at that rating Share this post Link to post Share on other sites
953 nut 51,631 #9 Posted November 10, 2017 I have no idea what wattage would be safe, but 10 watts would be 0.8 +/- amps at 12 volts and I am sure that would kill the coil in the ignition system. Don't know if Wheel Horse ever used the resister. Share this post Link to post Share on other sites
pfrederi 17,146 #10 Posted November 10, 2017 (edited) Concept was to protect the ignition coil if somehow current leaked into the circuit back up in the ignition switch (dirty wet contacts??). Don't have one in any of my breakerless no problem so far. Kohler says 22 ohm 1/2 watt Edited November 10, 2017 by pfrederi 1 Share this post Link to post Share on other sites