Author	[Modern View]
Tomfg 12-19-2012 15:33:21 206.8.13.87 Report to Moderator	Now that my SC is running again, I decide to check the coil voltage so I don't burn up the new points. It's a 12 volt conversion, with 12 volt coil, with an external resistor. The voltage at the distributor side of the coil, with the engine running, is about 9.5 volts. Is this low enough so the points don't burn? Thanks, Tom [Reply]   [No Email]
old 12-19-2012 18:57:43 209.86.226.19 Report to Moderator	Re: 12 volt coil voltage in reply to Tomfg, 12-19-2012 15:33:21   Sorry but what you read was not true voltage since a meter is not fast enough to catch a true reading like that. To do a read you need to check the voltage 2 ways. #1 with it not running and the points closed you should read almost no volts and with the points open full 12 volts then post back what you get [Reply]  [No Email]
Tomfg 12-20-2012 12:08:50 206.8.13.87 Report to Moderator	Re: 12 volt coil voltage in reply to old, 12-19-2012 18:57:43   Old, I checked the coil voltage as you suggested today. With the ignition on, I cranked the engine over by hand very slowly, and read the voltage thru three cycles of points opening and closing. The "closed" voltage varied from about 3 to 4.7 volts, and the "open points" voltage averaged between 11.5 to 11.7 volts. Thanks, Tom [Reply]  [No Email]
mEl 12-20-2012 14:02:54 141.151.107.238 Report to Moderator	Re: 12 volt coil voltage in reply to Tomfg, 12-20-2012 12:08:50   Quoting Removed, click Modern View to see Tom, I admit to being a bit puzzled by your 3-4.7 V points closed.You should read no voltage unless the points are dirty setting up a resistance. The points are a ground point till they switch open. Unless the contact material contains some resistance. mEl [Reply]  [No Email]
Tomfg 12-20-2012 14:20:53 206.8.13.87 Report to Moderator	Re: 12 volt coil voltage in reply to mEl, 12-20-2012 14:02:54   Brand new points, and tractor is running great, so I guess I don't know either! [Reply]  [No Email]
old 12-20-2012 12:33:09 209.86.226.32 Report to Moderator	Re: 12 volt coil voltage in reply to Tomfg, 12-20-2012 12:08:50   Ok when open that says you have battery volts or close as you should have. When closed you read voltage dropped across the coil and resister which again reads close to what you should. If you where to read it with out cranking it with the points open you should have read battery volts as in 12.3 or so but with you cranking it the voltage reading will be a bit less then battery volts due to starter draw. Same holds true as for the voltage with the point open. If you had check voltage by hand turning the engine you would have probably read 12.3 or so open and around 6 volts when closed but what you got says your just fine [Reply]  [No Email]
Tomfg 12-20-2012 14:25:08 206.8.13.87 Report to Moderator	Re: 12 volt coil voltage in reply to old, 12-20-2012 12:33:09   Thanks for the input, guess I'll call it good! [Reply]  [No Email]
old 12-20-2012 14:32:29 209.86.226.11 Report to Moderator	Re: 12 volt coil voltage in reply to Tomfg, 12-20-2012 14:25:08   Ya I would call it good. Ya if down the road you burn up point then maybe need to dig deeper but I'll bet you do not have any problems [Reply]  [No Email]
1370rod 12-19-2012 17:06:37 174.125.224.243 Report to Moderator	Re: 12 volt coil voltage in reply to Tomfg, 12-19-2012 15:33:21   I think your OK, I have converted several by doing the same thing and to be honest about it never checked the voltage and everything worked fine. One thing we have to remember is with the resister installed the amperage flow is really restricted and that is was does the most damage. Think of it this way, grab that coil wire when the engine is running. now we know it will give you a jolt and maybe even loosen some dental work (I;m kidding), But it won't kill you. Now that was probably 50,000 volts, but low amperage. Now what would happen if you grabbed a live 240v line, those have high amperage and we know what would happen , not good. On the same hand one can grab terminals of a good 12v batt and nothing happens. 12 volts (pressure) is to low to push amps (flow) through us that would hurt us. Sorry for the windy post, I got carried away, Rod. [Reply]  [No Email]
casecollectorsc 12-19-2012 15:58:07 64.33.230.195 Report to Moderator	Re: 12 volt coil voltage in reply to Tomfg, 12-19-2012 15:33:21   Don't know what is legally right but I have a lot of hours on Case gas engines with a ballast resistor and 12 volt coil and never burn points. Surely someone will come along and say I'm wrong, but thats what I do. [Reply]  [No Email]
chuck machinist 12-19-2012 17:04:28 96.225.131.208 Report to Moderator	Re: 12 volt coil voltage in reply to casecollectorsc, 12-19-2012 15:58:07   I went to the [archives] {keyword search]converting 6volts to 12 volts then I selected YT articles instead of the Case forum,and found some of the info your looking for .good luck Chuck [Reply]  [No Email]
Tomfg 12-19-2012 19:36:22 206.8.13.87 Report to Moderator	Re: 12 volt coil voltage in reply to chuck machinist, 12-19-2012 17:04:28   Thanks for the replies. I'll do some more reading tonight, and some experimenting tomorrow! [Reply]  [No Email]